Fix pasteboard banner when editing text.

[pixlwave]

Inspecting the items on the pasteboard to determine whether pasting is possible causes the banner to appear. This PR updates the check to inspect the types on the pasteboard instead. I didn't seem to see this when copying an image from Safari (presumably as there is also text on the pasteboard in the form of a URL so it doesn't go up the responder chain to check), but could reproduce it when copying an image from the photos app.

Fixes #5324

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[github-actions]

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[ismailgulek]

LGTM!

[codecov-commenter]

Codecov Report

Merging #6336 (a2c1731) into develop (8927bff) will increase coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff            @@
##           develop    #6336    +/-   ##
=========================================
  Coverage     6.17%    6.18%            
=========================================
  Files         1440     1440            
  Lines       155408   155102   -306     
  Branches     62521    62363   -158     
=========================================
- Hits          9592     9587     -5     
+ Misses      145413   145112   -301     
  Partials       403      403            

Impacted Files	Coverage Δ
...t/Views/RoomInputToolbar/MXKRoomInputToolbarView.m	0.00% <0.00%> (ø)
.../Modules/Spaces/SpaceList/SpaceListViewModel.swift	37.45% <0.00%> (-0.50%)	⬇️
Riot/Modules/Application/AppCoordinator.swift	53.26% <0.00%> (-0.24%)	⬇️
Riot/Modules/Application/LegacyAppDelegate.m	13.55% <0.00%> (-0.14%)	⬇️
Riot/Categories/Publisher+Riot.swift	66.66% <0.00%> (ø)
Riot/Modules/Room/RoomCoordinator.swift	0.00% <0.00%> (ø)
Riot/Modules/Settings/SettingsViewController.m	0.00% <0.00%> (ø)
RiotSwiftUI/Modules/Common/Theme/ThemeKey.swift	62.50% <0.00%> (ø)
RiotSwiftUI/Modules/Common/Util/SearchBar.swift	0.00% <0.00%> (ø)
RiotSwiftUI/Modules/Common/Mock/ScreenList.swift	0.00% <0.00%> (ø)
... and 213 more

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[gileluard]

lgtm