r.viewshed: fix https://trac.osgeo.org/grass/changeset/49498

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@49544 15284696-431f-4ddb-bdfa-cd5b030d7da7

raster/r.viewshed/main.cpp

@@ -485,7 +485,6 @@ parse_args(int argc, char *argv[], int *vpRow, int *vpCol,
     viewLocOpt = G_define_standard_option(G_OPT_M_EN);
     viewLocOpt->key = "coordinate";
     viewLocOpt->required = YES;
-    viewLocOpt->multiple = NO;
     viewLocOpt->description = _("Coordinates of viewing position");
 
     /* observer elevation */