fix(AngleTool): fixed bug that was preventing text box to handle for 0 deg angle

[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. (Reproducible on OHIF V3 and V2)

• What is the current behavior? (You can also link to an open issue here) The current behavior is that, if you create a Angle on OHIF currently, if this angle has exactly 0 degrees the text label will not be rendered.

• What is the new behavior (if this is a feature change)? Now the 0° label is shown.

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

• Other information:

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 24.45%. Comparing base (dbf874f) to head (8365fd1).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1570 +/- ## ========================================== + Coverage 23.86% 24.45% +0.59% ========================================== Files 287 287 Lines 10141 10145 +4 Branches 2082 2085 +3 ========================================== + Hits 2420 2481 +61 + Misses 6575 6529 -46 + Partials 1146 1135 -11 ```

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[igoroctaviano]

@ViniciusResende could you replicate this issue using ohif v2 and cstools?

[ViniciusResende]

@igoroctaviano yes, I could replicate both the error and the fix on OHIF v2. Although is not easy to replicate it, since the angle have to be exactly 0.