ENH: ctkCrosshairLabelTest2: Allow for small differences from baseline images
ENH: ctkCrosshairLabelTest2: Allow for small differences from baseline images

Allow for small differences from baseline images in ctkCrosshairLabelTest2.
Visual inspection of the differences show minimal differences in the background
pixmap, perhaps due to different scaling from when the baseline was created.

CJGoch/CTK,CJGoch/CTK,SINTEFMedtek/CTK,commontk/CTK,commontk/CTK,jcfr/CTK,SINTEFMedtek/CTK,CJGoch/CTK,commontk/CTK,jcfr/CTK,CJGoch/CTK,SINTEFMedtek/CTK,commontk/CTK,jcfr/CTK,SINTEFMedtek/CTK,CJGoch/CTK,jcfr/CTK,jcfr/CTK,SINTEFMedtek/CTK