Fix play/pause button to update more consistently

If you pause or resume the video too quickly, either by clicking the
pause/play button or through keypress, the OSC does not update itself
immediately. This workaround adds a small delay after pausing so that
the OSC can update itself promptly.

Original commit from: cyl0/ModernX@8cd17a3
Code taken from here: mpv-player/mpv#8155 (comment)
Related issues:
mpv-player/mpv#8172
mpv-player/mpv#8350

scripts/modernx.lua

@@ -2176,6 +2176,7 @@ end
 
 function pause_state(name, enabled)
     state.paused = enabled
+    mp.add_timeout(0.1, function() state.osd:update() end)
     if user_opts.showonpause then
         if enabled then
             state.lastvisibility = user_opts.visibility