Fix issue in hasUploadedFile() where it incorrectly returns false when the file is uploaded

[bilal-alsharifi]

Fixes #1692

This PR is ready for review.

Risk

This PR makes no API changes.

Testing Plan

• I have verified that I have not introduced new warnings in this PR (or explain why below)
• I have run the unit tests with this PR
• I have tested this PR against Core and verified behavior (if applicable, if not applicable, explain why below).
• I have tested Android

Core Tests

1. Send a graphic of type persistent
2. Send the same graphic with type non-persistent
3. Kill the app
4. Re-open and connect the app to the same Core instance (e.g. Manticore)
5. Send the graphic with type non-persistent and confirm that the image appears

Core version / branch / commit hash / module tested against: Core 7.1.1
HMI name / version / branch / commit hash / module tested against: 0.10.0

Summary

This PR fixes an issue in FileManager.hasUploadedfile() method where it incorrectly returns false when the file is uploaded

CLA

• I have signed the CLA

[codecov]

Codecov Report

Merging #1693 (cacb979) into develop (ad5fc1e) will decrease coverage by 0.00%.
The diff coverage is 14.28%.

❗ Current head cacb979 differs from pull request most recent head 6c4da87. Consider uploading reports for the commit 6c4da87 to get more accurate results

@@              Coverage Diff              @@
##             develop    #1693      +/-   ##
=============================================
- Coverage      54.15%   54.15%   -0.01%     
+ Complexity      5336     5334       -2     
=============================================
  Files            555      555              
  Lines          24582    24586       +4     
  Branches        3108     3111       +3     
=============================================
+ Hits           13313    13314       +1     
- Misses         10109    10113       +4     
+ Partials        1160     1159       -1     

Impacted Files	Coverage Δ	Complexity Δ
...smartdevicelink/managers/file/BaseFileManager.java	65.97% <14.28%> (-0.87%)	30.00 <2.00> (ø)
...ink/managers/screen/BaseTextAndGraphicManager.java	63.75% <0.00%> (-0.42%)	50.00% <0.00%> (-2.00%)
...rtdevicelink/streaming/video/SdlRemoteDisplay.java	51.21% <0.00%> (+1.21%)	5.00% <0.00%> (ø%)