r3.in.xyz: use standardized option for separator (merge from trunk, https://trac.osgeo.org/grass/changeset/64652)

git-svn-id: https://svn.osgeo.org/grass/grass/branches/releasebranch_7_0@64653 15284696-431f-4ddb-bdfa-cd5b030d7da7

scripts/r3.in.xyz/r3.in.xyz.py

@@ -71,14 +71,7 @@
 #% description: Storage type for resultant raster map
 #% answer: float
 #%End
-#%Option
-#% key: separator
-#% type: string
-#% required: no
-#% multiple: no
-#% key_desc: character
-#% description: Field separator
-#% answer: |
+#%Option G_OPT_F_SEP
 #% guisection: Input
 #%End
 #%Option