design: Remove redundant voice message button

lib/pages/chat/chat.dart

@@ -767,9 +767,6 @@ class ChatController extends State<Chat> {
     if (choice == 'sticker') {
       sendStickerAction();
     }
-    if (choice == 'voice') {
-      voiceMessageAction();
-    }
     if (choice == 'location') {
       sendLocationAction();
     }

lib/pages/chat/chat_input_row.dart

@@ -144,19 +144,6 @@ class ChatInputRow extends StatelessWidget {
                           contentPadding: const EdgeInsets.all(0),
                         ),
                       ),
-                    if (PlatformInfos.isMobile)
-                      PopupMenuItem<String>(
-                        value: 'voice',
-                        child: ListTile(
-                          leading: const CircleAvatar(
-                            backgroundColor: Colors.red,
-                            foregroundColor: Colors.white,
-                            child: Icon(Icons.mic_none_outlined),
-                          ),
-                          title: Text(L10n.of(context).voiceMessage),
-                          contentPadding: const EdgeInsets.all(0),
-                        ),
-                      ),
                     if (PlatformInfos.isMobile)
                       PopupMenuItem<String>(
                         value: 'location',