v.category: fix Windows bug, see http://osgeo-org.1560.x6.nabble.com/problems-running-v-centroids-td5266061.html

git-svn-id: https://svn.osgeo.org/grass/grass/branches/releasebranch_7_0@68956 15284696-431f-4ddb-bdfa-cd5b030d7da7

scripts/v.centroids/v.centroids.py

@@ -60,7 +60,7 @@ def main():
 	if num_bound == 0:
 	    grass.fatal(_("Input vector map contains no boundaries."))
 
-	grass.exec_command("v.category", type = 'area', **options)
+	grass.run_command("v.category", type = 'area', **options)
 
     sys.exit(0)