Fix #35473: Using Redo panel in View3D after Grease Pencil action moves GP layer to that area

Remove REGISTER flag from GP draw operator, so redo wouldn't screw up regions.

source/blender/editors/gpencil/gpencil_paint.c

@@ -2051,7 +2051,7 @@ void GPENCIL_OT_draw(wmOperatorType *ot)
 	ot->poll = gpencil_draw_poll;
 	
 	/* flags */
-	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO | OPTYPE_BLOCKING;
+	ot->flag = OPTYPE_UNDO | OPTYPE_BLOCKING;
 	
 	/* settings for drawing */
 	ot->prop = RNA_def_enum(ot->srna, "mode", prop_gpencil_drawmodes, 0, "Mode", "Way to interpret mouse movements");