fix v.dissolve (import grass.script)

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@38598 15284696-431f-4ddb-bdfa-cd5b030d7da7

scripts/v.dissolve/v.dissolve.py

@@ -56,9 +56,10 @@
 
 import sys
 import os
-from grass.script import core as grass
 import atexit
 
+import grass.script as grass
+
 def cleanup():
     nuldev = file(os.devnull, 'w')
     grass.run_command('g.remove', vect = '%s_%s' % (output, tmp), quiet = True, stderr = nuldev)