Use the same map identifier for raster and raster3d maps

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@51408 15284696-431f-4ddb-bdfa-cd5b030d7da7

raster/r.univar/r3.univar_main.c

@@ -28,7 +28,7 @@ zone_type zone_info;
 /* ************************************************************************* */
 void set_params()
 {
-    param.inputfile = G_define_standard_option(G_OPT_R3_INPUT);
+    param.inputfile = G_define_standard_option(G_OPT_R3_MAP);
 
     param.zonefile = G_define_standard_option(G_OPT_R3_INPUT);
     param.zonefile->key = "zones";