Rc/v3 small bug fixes

[amitantony]

minor fixes for the new release

• typo in the info page
• plnStfMatch flag triggering multiple warnings
• type cast issue in dicomWidget

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 50.23%. Comparing base (3013c99) to head (f4d11ee).
Report is 1 commits behind head on rc/v3.

Files with missing lines	Patch %	Lines
matRad/gui/widgets/matRad_importDicomWidget.m	0.00%	3 Missing ⚠️
matRad/gui/widgets/matRad_WorkflowWidget.m	0.00%	2 Missing ⚠️
matRad/gui/matRad_Widget.m	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            rc/v3     #788      +/-   ##
==========================================
- Coverage   50.27%   50.23%   -0.04%     
==========================================
  Files         598      598              
  Lines       37250    37250              
==========================================
- Hits        18728    18714      -14     
- Misses      18522    18536      +14     

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