Fixed wron start_time assinment

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@61215 15284696-431f-4ddb-bdfa-cd5b030d7da7

temporal/t.rast.aggregate/t.rast.aggregate.py

@@ -139,7 +139,7 @@ def main():
 
     # In case no end time is available, then we use the start time of the last map layer
     if end_time is None:
-        end_time,  tmp_value = map_list[- 1].temporal_extent.get_start_time()
+        end_time = map_list[- 1].temporal_extent.get_start_time()
         has_end_time = False
 
     granularity_list = []