global: Run maybe_gc at leisure again

The deadlocks are now fixed this should keep memory usage low,
avoid memory fragmentation and prevent the gc from running at
inconvient times.

src/shell-global.c

@@ -1401,6 +1401,10 @@ run_leisure_functions (gpointer data)
   if (global->work_count > 0)
     return FALSE;
 
+  /* This will help avoid both heap fragmentation, 
+     and the GC kicking in when we don't want it to. */
+  gjs_context_maybe_gc (global->js_context);
+
   /* No leisure closures, so we are done */
   if (global->leisure_closures == NULL)
     return FALSE;