fix(composer) : use HideKeyboardWhenDisposed only in MessagesView

[ganfra]

Content

What the title says.

Motivation and context

TextComposer is disposed each time the size changes for some reason, so the keyboard was dismissed when typing.

Screenshots / GIFs

Tests

• Step 1
• Step 2
• Step ...

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

[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 SonarQube Cloud

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.09%. Comparing base (01cd76a) to head (a81392d).
Report is 6 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3993   +/-   ##
========================================
  Coverage    83.09%   83.09%           
========================================
  Files         1808     1808           
  Lines        45887    45887           
  Branches      5394     5395    +1     
========================================
  Hits         38131    38131           
  Misses        5862     5862           
  Partials      1894     1894           

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