text: Title: Add option to scrub all region tags in Exif information when using "delete face"
  Body: **Describe the enhancement you'd like**
  I have some pictures that have (wrong) face areas defined from a previous version of digikam - would it be possible to scrub the EXIF info from all face info when using "delete face"? It seems right now only librephoto tags are scrubbed
  After using the "delete face" I still have region and name information in the file
  
  **Describe why this will benefit the LibrePhotos**
  Deleting face regions that are wrong would improve the data quality and training date for face recognition
  
  **Additional context**
  It seems Librephotos is using the "Region Rectangle" to define the face area. 
  Digikam tags look like this (real example)
  
  Region Applied To Dimensions H  : 2304
  Region Applied To Dimensions Unit: pixel
  Region Applied To Dimensions W  : 3456
  Region Name                     : Personname
  Region Type                     : Face, Face
  Region Area X                   : 0.330874, 0.161892
  Region Area Y                   : 0.771701, 0.498047
  Region Area W                   : 0.175637, 0.128762
  Region Area H                   : 0.315972, 0.193142
  Region Area Unit                : normalized, normalized
  Tags List                       : People/Personname
  
  
  Adding an option in settings to scrub this when deleting faces would make sense. This should only be applied to face regions, which is the defined in the "Region Type" tag