apply get-draw_plane func changes

OP_cursor_snap_canvas.py

@@ -48,7 +48,7 @@ class GPTB_OT_cusor_snap(bpy.types.Operator):
         if warning:
             self.report({'WARNING'}, ', '.join(warning))
 
-        plane_co, plane_no = get_gp_draw_plane(context)
+        plane_co, plane_no = get_gp_draw_plane()
 
         if not plane_co:#default to object location
             plane_co = context.object.matrix_world.to_translation()#context.object.location