Revert "shell/window-tracker: Exclude screen recorder window"

This reverts commit 575ba13b9b.

That commit did not actually prevent the "Unknown" application from
showing up in the dash or app switcher when the recorder was running,
but it introduced a problem with Proton which also uses gstreamer OpenGL
elements in its transcoder. This was causing the overview to get stuck
while the transcoder was running due to the app for the
"OpenGL Renderer" window being null.

Closes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/7042
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/3000>

src/shell-window-tracker.c

@@ -412,13 +412,6 @@ get_app_for_window (ShellWindowTracker    *tracker,
   if (meta_window_is_remote (window))
     return _shell_app_new_for_window (window);
 
-  /* HACK: Exclude screen recorder from tracking until
-   * we implement a proper fix
-   */
-  if (meta_window_get_wm_class (window) == NULL &&
-      g_strcmp0 (meta_window_get_title (window), "OpenGL Renderer") == 0)
-    return NULL;
-
   /* Check if the app's WM_CLASS specifies an app; this is
    * canonical if it does.
    */