dials.export_bitmaps: scale resolution rings according to binning

[rjgildea]

Fixes #2391

Using dials.export_bitmaps $(dials.data get -q x4wide)/*0001.cbf resolution_rings.show=True with binning=1:

binning=2:

binning=4:

binning=8:

[dagewa]

Thanks! Glad it turned out to be reasonably simple :)

[codecov]

Codecov Report

Merging #2392 (9085e05) into main (18146d1) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

❗ Current head 9085e05 differs from pull request most recent head 0f7f2da. Consider uploading reports for the commit 0f7f2da to get more accurate results

@@            Coverage Diff             @@
##             main    #2392      +/-   ##
==========================================
- Coverage   78.62%   78.60%   -0.02%     
==========================================
  Files         603      603              
  Lines       73626    73627       +1     
  Branches    10002    10002              
==========================================
- Hits        57885    57878       -7     
- Misses      13611    13617       +6     
- Partials     2130     2132       +2