[v1.5.0] Fixes default dtype value for onnx hardtanh export (opset11) (#35467)

[gchanan]

Summary:
Oneline fix to lara-hdr 's PR #30169.

Default dtype value should be set when dtype is None rather than when dtype is not None.

I didn't make an issue for this as such a small change but I have been using this locally in order to export a model with opset 11 (opset 10 still works).
Pull Request resolved: #35467

Differential Revision: D20686048

Pulled By: mruberry

fbshipit-source-id: 726a5f9c0711c7a79b171fe98b602cdef27f9b31

[dr-ci]

💊 CircleCI build failures summary and remediations

As of commit 6c519a1 (more details on the Dr. CI page):

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• 2/2 failures introduced in this PR

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🕵️ 2 new failures recognized by patterns

The following build failures do not appear to be due to upstream breakages:

pytorch_cpp_doc_push (1/2)

Step: "Doc Build and Push" (full log | pattern match details | 🔁 rerun) <confirmed not flaky by 2 failures>

Apr 08 00:26:46 AttributeError: module 'sphinx.domains.c' has no attribute 'CMacroObject'

Apr 08 00:26:44     Found existing installation: Sphinx 3.0.0 
Apr 08 00:26:44     Uninstalling Sphinx-3.0.0: 
Apr 08 00:26:44       Successfully uninstalled Sphinx-3.0.0 
Apr 08 00:26:45 Successfully installed sphinx-2.4.4 
Apr 08 00:26:45 ++ make VERBOSE=1 html -j 
Apr 08 00:26:46 Running Sphinx v2.4.4 
Apr 08 00:26:46  
Apr 08 00:26:46 Exception occurred: 
Apr 08 00:26:46   File "/opt/conda/lib/python3.6/site-packages/breathe/renderer/sphinxrenderer.py", line 90, in DomainDirectiveFactory 
Apr 08 00:26:46     'define': (c.CMacroObject, 'macro'), 
Apr 08 00:26:46 AttributeError: module 'sphinx.domains.c' has no attribute 'CMacroObject' 
Apr 08 00:26:46 The full traceback has been saved in /tmp/sphinx-err-4ij3nz_2.log, if you want to report the issue to the developers. 
Apr 08 00:26:46 Please also report this if it was a user error, so that a better error message can be provided next time. 
Apr 08 00:26:46 A bug report can be filed in the tracker at <https://github.com/sphinx-doc/sphinx/issues>. Thanks! 
Apr 08 00:26:46 Makefile:27: recipe for target 'html' failed 
Apr 08 00:26:46 make: *** [html] Error 2 

pytorch_windows_vs2019_py36_cuda10.1_build (2/2)

Step: "Build" (full log | pattern match details | 🔁 rerun) <confirmed not flaky by 2 failures>

ERROR: The process "sccache.exe" not found.

curl --retry 3 -k https://s3.amazonaws.com/ossci-windows/sccache.exe --output C:\Users\circleci\project\build\win_tmp\bin\sccache.exe   
 curl --retry 3 -k https://s3.amazonaws.com/ossci-windows/sccache-cl.exe --output C:\Users\circleci\project\build\win_tmp\bin\sccache-cl.exe  
)  else ( 
aws s3 cp s3://ossci-windows/sccache.exe C:\Users\circleci\project\build\win_tmp\bin\sccache.exe   
 aws s3 cp s3://ossci-windows/sccache-cl.exe C:\Users\circleci\project\build\win_tmp\bin\sccache-cl.exe  
)   
 goto :check_sccache  
) )  
'C:\Users\circleci\project\build\win_tmp\bin\sccache.exe' is not recognized as an internal or external command, 
operable program or batch file. 
ERROR: The process "sccache.exe" not found. 
Could Not Find C:\Users\circleci\project\build\win_tmp\bin\sccache.exe 
Could Not Find C:\Users\circleci\project\build\win_tmp\bin\sccache-cl.exe 
Completed 5.0 MiB/5.3 MiB (20.3 MiB/s) with 1 file(s) remaining  Completed 5.2 MiB/5.3 MiB (21.2 MiB/s) with 1 file(s) remaining  Completed 5.3 MiB/5.3 MiB (21.3 MiB/s) with 1 file(s) remaining  download: s3://ossci-windows/sccache.exe to build\win_tmp\bin\sccache.exe 
Completed 25.0 KiB/25.0 KiB (228.6 KiB/s) with 1 file(s) remaining download: s3://ossci-windows/sccache-cl.exe to build\win_tmp\bin\sccache-cl.exe 
 
circleci@PACKER-5E70C994 C:\Users\circleci\project>C:\Users\circleci\project\build\win_tmp\bin\sccache.exe --show-stats   || ( 
taskkill /im sccache.exe /f /t   || ver  1>nul   
 del C:\Users\circleci\project\build\win_tmp\bin\sccache.exe   || ver  1>nul   
 del C:\Users\circleci\project\build\win_tmp\bin\sccache-cl.exe   || ver  1>nul   
 if "pytorch-win-ws2019-cuda10-cudnn7-py3" == "" ( 

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