Only disable the composer if the room is yet to be created.

[pixlwave]

Fixes #6708 as the composer was being disabled and then immediately re-enabled. Didn't figure out why this was only visible on some devices, but the fix was to not disable the composer in an existing room.

Before	After

[pixlwave]

@yostyle Added you for the review to double check you're happy with the change :)

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[codecov]

Codecov Report

Base: 9.96% // Head: 9.94% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (61100ba) compared to base (60c8be0).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #6733      +/-   ##
===========================================
- Coverage     9.96%    9.94%   -0.02%     
===========================================
  Files         1484     1484              
  Lines       150509   150506       -3     
  Branches     60753    60750       -3     
===========================================
- Hits         14995    14975      -20     
- Misses      134960   134978      +18     
+ Partials       554      553       -1     

Impacted Files	Coverage Δ
Riot/Modules/Room/RoomViewController.m	0.00% <0.00%> (ø)
...SplashScreen/OnboardingSplashScreenViewModel.swift	11.53% <0.00%> (-42.31%)	⬇️
...ing/SplashScreen/View/OnboardingSplashScreen.swift	54.66% <0.00%> (-4.00%)	⬇️
...ojiPicker/Data/EmojiMart/EmojiItem+EmojiMart.swift	95.34% <0.00%> (-0.31%)	⬇️

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[github-actions]

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[aringenbach]

LGTM