Updated function name to use the new tgis API naming

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@56614 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/animation/temporal_manager.py

@@ -242,7 +242,7 @@ class TemporalManager(object):
 
                 series = map.get_id()
 
-                start, end = map.get_valid_time()
+                start, end = map.get_temporal_extent_as_tuple()
                 if end:
                     end = str(end)
                 if end is None: