Prevent login using keyboard when homeserver is loading.

[pixlwave]

Tiny bugfix I noticed whilst porting the screen over to ElementX where you could hit return whilst the service was loading a homeserver and it would attempt to login.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[ismailgulek]

LGTM!

[github-actions]

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[codecov-commenter]

Codecov Report

Merging #6338 (542dd06) into develop (ff5bbd2) will increase coverage by 0.01%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           develop    #6338      +/-   ##
===========================================
+ Coverage     6.17%    6.19%   +0.01%     
===========================================
  Files         1440     1440              
  Lines       155100   155102       +2     
  Branches     62361    62362       +1     
===========================================
+ Hits          9584     9608      +24     
+ Misses      145113   145089      -24     
- Partials       403      405       +2     

Impacted Files	Coverage Δ
...thentication/Login/AuthenticationLoginModels.swift	44.00% <0.00%> (-6.00%)	⬇️
...ication/Login/View/AuthenticationLoginScreen.swift	0.00% <0.00%> (ø)
...t/Views/RoomInputToolbar/MXKRoomInputToolbarView.m	0.00% <0.00%> (ø)
...ing/SplashScreen/View/OnboardingSplashScreen.swift	58.66% <0.00%> (+4.00%)	⬆️
...Modules/Common/ViewModel/StateStoreViewModel.swift	50.00% <0.00%> (+19.44%)	⬆️
...SplashScreen/OnboardingSplashScreenViewModel.swift	53.84% <0.00%> (+42.30%)	⬆️

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