Enabled Audio scrubbing in LMB dragging in IpoWindow and TimeLine.

source/blender/src/space.c

@@ -2132,7 +2132,7 @@ static void winqreadipospace(ScrArea *sa, void *spacedata, BWinEvent *evt)
 					
 					if( cfra!=CFRA ) {
 						CFRA= cfra;
-						update_for_newframe_nodraw(1);	/* 1 = nosound */
+						update_for_newframe_nodraw(0);	/* 1 = nosound */
 						force_draw_all(0); /* To make constraint sliders redraw */
 					}
 					else PIL_sleep_ms(30);