r.in.wms: srs param seems to be required

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@54290 15284696-431f-4ddb-bdfa-cd5b030d7da7

scripts/r.in.wms/r.in.wms.py

@@ -43,6 +43,7 @@ This program is free software under the GNU General Public License
 #% type: integer
 #% description: EPSG number of source projection for request 
 #% guisection: Request properties
+#% required: yes
 #%end
 
 #%option