Fix regression: Editing script disables mute buttons

This is quite a simple bug: If you edit a script, then close it, you
will no longer be able to use the mute buttons (N and M).

The problem here is that in 2.3, key.disabletextentry() was called when
closing a script. However, #944 removed the call. Therefore, a
regression.

desktop_version/src/Editor.cpp

@@ -3395,6 +3395,8 @@ void editorinput(void)
 
                 // Alright, now re-add the script.
                 ed.create_script(ed.current_script, ed.script_buffer);
+
+                key.disabletextentry();
             }
 
             if (ed.keydelay > 0) ed.keydelay--;