Correct usage of grass.db_describe()

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@34374 15284696-431f-4ddb-bdfa-cd5b030d7da7

scripts/v.db.dropcol/v.db.dropcol.py

@@ -85,7 +85,7 @@ def main():
 	# http://www.sqlite.org/faq.html#q13
 	colnames = []
 	coltypes = []
-	for f in grass.db_describe(table):
+	for f in grass.db_describe(table)['cols']:
 	    if f[0] == column:
 		continue
 	    colnames.append(f[0])

scripts/v.db.renamecol/v.db.renamecol.py

@@ -86,7 +86,7 @@ def main():
 
     # describe old col
     oldcoltype = None
-    for f in grass.db_describe(table):
+    for f in grass.db_describe(table)['cols']:
 	if f[0] != oldcol:
 	    continue
 	oldcoltype = f[1]