fix(SegRendering): preserve canvas transform matrix after seg render

[ViniciusResende]

• Please check if the PR fulfills these requirements

• [x] The commit message follows our guidelines

• [x] Tests for the changes have been added (for bug fixes / features)

• [x] Docs have been added / updated (for bug fixes / features)

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...) This PR contains a bug fix.

• What is the current behavior? (You can also link to an open issue here) The current behavior is that my overlay (rendered using the Overlay Tool) is getting resized and translated once the segmentation is rendered.

Note that the text is not even entirely on the screen, also there are two ellipsis that aren't even being shown, they appear on the screenshot below.

• What is the new behavior (if this is a feature change)? Now my overlay is not being resized nor translated and renders on the position where I expected it to be, also the segmentation kept working fine.

Now we can see that the text is well positioned and that the ellipsis are in the right place.

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?) This PR shoudn't introduce any breaking change.

• Other information: Previously after rendering the segmentation cornerstone was always transforming the canvas to follow the identity matrix, but in cases where we had an overlay using a different transformation matrix, it would undesirably affect the original overlay. Also did some minor refactorings on the renderFill function of the src/eventListeners/internals/renderSegmentationFill.js file.

[codecov[bot]]

Codecov Report

Merging #1549 (afa277c) into master (73cd522) will increase coverage by 0.55%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1549      +/-   ##
==========================================
+ Coverage   23.30%   23.86%   +0.55%     
==========================================
  Files         287      287              
  Lines       10138    10141       +3     
  Branches     2082     2082              
==========================================
+ Hits         2363     2420      +57     
+ Misses       6625     6575      -50     
+ Partials     1150     1146       -4     

Impacted Files	Coverage Δ
...eventListeners/internals/renderSegmentationFill.js	90.32% <100.00%> (+88.68%)	:arrow_up:
...ntListeners/internals/renderSegmentationOutline.js	81.18% <100.00%> (+0.18%)	:arrow_up:

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[igoroctaviano]

LGTM 🏅