schema parsers BUGFIX resolving groupings in submodules

instead of searching for the grouping from the uses statement up through
the tree, the search directly started in the module's top-level and only
the global groupings were checked.

Author: rkrejci

src/resolve.c

@@ -1868,7 +1868,7 @@ resolve_uses_schema_nodeid(const char *nodeid, const struct lys_node *start, con
     if (!module) {
         return -1;
     }
-    if (module != start->module) {
+    if (module != lys_main_module(start->module)) {
         start = module->data;
     }