Fix crash when Pin code screen is displayed

[bmarty]

Content

Ensure that lineHeight cannot be negative, else the application crashes.

Motivation and context

Closes https://github.com/element-hq/element-x-android-rageshakes/issues/2386

Screenshots / GIFs

Tests

• Cannot repro the crash, but can repro the error by tweaking the Preview height of PinUnlockViewPreview. With this fix the Preview is always rendered without issue.

Tested devices

• Physical
• Emulator
• OS version(s):

Checklist

• Changes have been tested on an Android device or Android emulator with API 23
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/element-hq/element-x-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the develop branch
• Pull request title will be used in the release note, it clearly define what will change for the user
• Pull request includes screenshots or videos if containing UI changes
• Pull request includes a sign off
• You've made a self review of your PR

[github-actions]

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.14%. Comparing base (d9599a2) to head (83a366a).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3205   +/-   ##
========================================
  Coverage    76.14%   76.14%           
========================================
  Files         1644     1644           
  Lines        38758    38759    +1     
  Branches      7501     7501           
========================================
+ Hits         29513    29514    +1     
  Misses        5350     5350           
  Partials      3895     3895           

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