d.barscale: make 'coords' paramater optional (with default answer)

            sync'ed with d.northarrow


git-svn-id: https://svn.osgeo.org/grass/grass/trunk@57731 15284696-431f-4ddb-bdfa-cd5b030d7da7

display/d.barscale/main.c

@@ -78,7 +78,6 @@ int main(int argc, char **argv)
     coords->type = TYPE_DOUBLE;
     coords->answer = "0.0,5.0";
     coords->options = "0-100";
-    coords->required = YES;
     coords->label =
 	_("Screen coordinates of the rectangle's top-left corner");
     coords->description = _("(0,0) is lower-left of the display frame");