Add tasmovies to recent list on load

This was removed in 42aa9d991d, but I don't remember if it was intentional or a mistake.
In any case it feels bad to open tas movies and not get them added to the recent list.

src/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.cs

@@ -533,6 +533,7 @@ namespace BizHawk.Client.EmuHawk
 			}
 
 			_engaged = true;
+			Settings.RecentTas.Add(CurrentTasMovie.Filename); // only add if it did load
 
 			if (startsFromSavestate)
 			{