Spawns TkLoop on import so people attempting to use TkPanels won't have them crash if they didn't specify want-tk #t

direct/src/showbase/TkGlobal.py

@@ -24,4 +24,5 @@ def spawnTkLoop():
     # Spawn this task
     taskMgr.add(tkLoop, "tkLoop")
 
-
+taskMgr.remove('tkLoop')
+spawnTkLoop()