Seamlessly switch for the RichTextEditor based message composer to the… (#2753)

* Seemlesly switch for the RichTextEditor based message composer to the plain one depending on whether formatting options are enabled or not.

* Address PR comments

* Fixes #2803 - Add extra padding at the bottom of the composer suggestions list

* Update preview test snapshots

* Update UI test snapshots

ElementX/Sources/Application/AppSettings.swift

@@ -36,7 +36,6 @@ final class AppSettings {
         case pusherProfileTag
         case logLevel
         case viewSourceEnabled
-        case richTextEditorEnabled
         case appAppearance
         case sharePresence
         case hideUnreadMessagesBadge
@@ -234,9 +233,6 @@ final class AppSettings {
     @UserPreference(key: UserDefaultsKeys.viewSourceEnabled, defaultValue: false, storageType: .userDefaults(store))
     var viewSourceEnabled
 
-    @UserPreference(key: UserDefaultsKeys.richTextEditorEnabled, defaultValue: true, storageType: .userDefaults(store))
-    var richTextEditorEnabled
-    
     // MARK: - Element Call
     
     @UserPreference(key: UserDefaultsKeys.elementCallBaseURL, defaultValue: "https://call.element.io", storageType: .userDefaults(store))