r.mask: show --overwrite flag

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@54304 15284696-431f-4ddb-bdfa-cd5b030d7da7

scripts/r.mask/r.mask.py

@@ -19,6 +19,7 @@
 #% description: Creates a MASK for limiting raster operation.
 #% keywords: raster
 #% keywords: mask
+#% overwrite: yes
 #%end
 #%option G_OPT_R_INPUT
 #% key: raster