v.db.update: complete parameter key change

git-svn-id: https://svn.osgeo.org/grass/grass/branches/releasebranch_7_0@63212 15284696-431f-4ddb-bdfa-cd5b030d7da7

scripts/v.db.update/v.db.update.py

@@ -53,7 +53,7 @@ def main():
     layer = options['layer']
     column = options['column']
     value = options['value']
-    qcolumn = options['qcolumn']
+    qcolumn = options['query_column']
     where = options['where']
 
     mapset = grass.gisenv()['MAPSET']