Stop the settings button from appearing while footer is fading out

The designs actually never want us to show the settings button in the footer if an app bar is in use (as in Element X mobile apps), so just avoid showing it at all in that case.

src/room/InCallView.tsx

@@ -570,8 +570,6 @@ export const InCallView: FC<InCallViewProps> = ({
     matrixRoom.roomId,
   );
 
-  const settingsButtonInAppBar =
-    headerStyle === HeaderStyle.AppBar && showHeader;
   useAppBarSecondaryButton(
     <SettingsIconButton
       key="settings"
@@ -603,7 +601,9 @@ export const InCallView: FC<InCallViewProps> = ({
       audioOutputSwitcher={audioOutputSwitcher ?? undefined}
       // Only pass the openSettings function if the settings button is not in the app bar.
       // If there is no fn the button will be hidden in the footer.
-      openSettings={settingsButtonInAppBar ? undefined : openSettings}
+      openSettings={
+        headerStyle === HeaderStyle.AppBar ? undefined : openSettings
+      }
       hangup={vm.hangup}
       //Debug props
       debugTileLayout={debugTileLayout}