Fixed small annoyonce that was there for long;

New objects were not created with correct 'ipowin' value, to denote the
default ipo to show. That caused sometimes wrong display with weird empty
menu button in header.

source/blender/src/space.c

@@ -4130,7 +4130,7 @@ void allqueue(unsigned short event, short val)
 					scrarea_queue_headredraw(sa);
 					if(val) {
 						si= sa->spacedata.first;
-						if (!G.sipo->pin)							
+						if (si->pin==0)							
 							si->blocktype= val;
 					}
 				}