r.random: use standardized options (https://trac.osgeo.org/grass/ticket/2409)

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@63133 15284696-431f-4ddb-bdfa-cd5b030d7da7

raster/r.random/main.c

@@ -65,7 +65,7 @@ int main(int argc, char *argv[])
     parm.cover->description = _("Name of cover raster map");
 
     parm.npoints = G_define_option();
-    parm.npoints->key = "n";
+    parm.npoints->key = "npoints";
     parm.npoints->key_desc = "number[%]";
     parm.npoints->type = TYPE_STRING;
     parm.npoints->required = YES;