refactor: Theme and iOS stuff

lib/views/chat_list.dart

@@ -256,7 +256,6 @@ class _ChatListState extends State<ChatList> {
                     ? null
                     : FloatingActionButton(
                         child: Icon(Icons.add_outlined),
-                        backgroundColor: Theme.of(context).primaryColor,
                         onPressed: () => AdaptivePageLayout.of(context)
                             .pushNamedAndRemoveUntilIsFirst('/newprivatechat'),
                       ),

lib/views/new_group.dart

@@ -73,8 +73,6 @@ class _NewGroupState extends State<NewGroup> {
         ],
       ),
       floatingActionButton: FloatingActionButton(
-        foregroundColor: Colors.white,
-        backgroundColor: Theme.of(context).primaryColor,
         onPressed: () => submitAction(context),
         child: Icon(Icons.arrow_forward_outlined),
       ),

lib/views/new_private_chat.dart

@@ -212,8 +212,6 @@ class _NewPrivateChatState extends State<NewPrivateChat> {
       floatingActionButton: FloatingActionButton(
         onPressed: () => submitAction(context),
         child: Icon(Icons.arrow_forward_outlined),
-        foregroundColor: Colors.white,
-        backgroundColor: Theme.of(context).primaryColor,
       ),
     );
   }

lib/views/settings_emotes.dart

@@ -181,7 +181,6 @@ class _EmotesSettingsState extends State<EmotesSettings> {
                   showSave = false;
                 });
               },
-              backgroundColor: Theme.of(context).primaryColor,
             )
           : null,
       body: StreamBuilder(