remove theming of call buttons to remove disabled look for dark mode

In dark mode, the call buttons looked like disabled otherwise.

There is still the 3-dots menu next to the call icons like disabled for dark and light mode. But this is a different bug that needs to be fixed in another branch(could not find the reason for now).

Signed-off-by: Marcel Hibbe <dev@mhibbe.de>

app/src/main/java/com/nextcloud/talk/chat/ChatActivity.kt

@@ -2733,18 +2733,6 @@ class ChatActivity :
         super.onCreateOptionsMenu(menu)
         menuInflater.inflate(R.menu.menu_conversation, menu)
 
-        context.let {
-            viewThemeUtils.platform.colorToolbarMenuIcon(
-                it,
-                menu.findItem(R.id.conversation_voice_call)
-            )
-
-            viewThemeUtils.platform.colorToolbarMenuIcon(
-                it,
-                menu.findItem(R.id.conversation_video_call)
-            )
-        }
-
         if (conversationUser?.userId == "?") {
             menu.removeItem(R.id.conversation_info)
         } else {