v.transform: use standardized options (https://trac.osgeo.org/grass/ticket/2409)

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@63149 15284696-431f-4ddb-bdfa-cd5b030d7da7

vector/v.transform/main.c

@@ -149,7 +149,7 @@ int main(int argc, char *argv[])
     zscale->guisection = _("Custom");
 
     zrot = G_define_option();
-    zrot->key = "zrot";
+    zrot->key = "zrotation";
     zrot->type = TYPE_DOUBLE;
     zrot->required = NO;
     zrot->multiple = NO;