Fix widgets

[ericpre]

Fix various bugs with CircleWidget and Line2DWidget, which became noticeable following #2615.

Progress of the PR

• CircleWidget fixes:
  • Fix initialisation: the inner radius was incorrect. Previously, this was not noticeable, because the patch was updated, removing unnecessary patch update event makes this bug visible
  • Fix error when the inner radius reach zeros by decreasing the size
• Line2DWidget fixes:
  • Fix plotting of the linewidth indicator lines: same as for the CircleWidget, removing redundant update event makes this issue noticeable.
  • Fix removing add adding again linewidth indicator lines when the linewidth reaches zeros and is increased again
  • raise ValueError when linewidth > 0 and the scale of the axis are different.
• add entry to CHANGES.rst (if appropriate),
• add tests,
• ready for review.

[codecov]

Codecov Report

Merging #2625 (c6f0c52) into RELEASE_next_patch (b191b19) will increase coverage by 0.13%.
The diff coverage is 100.00%.

@@                  Coverage Diff                   @@
##           RELEASE_next_patch    #2625      +/-   ##
======================================================
+ Coverage               76.44%   76.58%   +0.13%     
======================================================
  Files                     202      202              
  Lines                   29688    29698      +10     
  Branches                 6493     6497       +4     
======================================================
+ Hits                    22696    22745      +49     
+ Misses                   5223     5187      -36     
+ Partials                 1769     1766       -3     

Impacted Files	Coverage Δ
hyperspy/drawing/_widgets/circle.py	74.38% <100.00%> (+21.48%)	⬆️
hyperspy/drawing/_widgets/line2d.py	54.29% <100.00%> (+4.70%)	⬆️
hyperspy/drawing/widget.py	69.64% <100.00%> (+0.39%)	⬆️
hyperspy/roi.py	78.02% <0.00%> (+0.67%)	⬆️

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[francisco-dlp]

LGTM, could you update it with Rnp?

[ericpre]

Done!