Return results even when the cache is disabled (#55505)

* Return results even when the cache is disabled

By default the cache is disabled and so the results of the API call
are not placed in there for the return statement to fetch.

* Always update self._cache to return

changelogs/fragments/55505-foreman-inventory.yaml

@@ -0,0 +1,2 @@
+bugfixes:
+  - Fix foreman inventory plugin when inventory caching is disabled

lib/ansible/plugins/inventory/foreman.py

@@ -162,9 +162,7 @@ class InventoryModule(BaseInventoryPlugin, Cacheable):
                     # get next page
                     params['page'] += 1
 
-            # Set the cache if it is enabled or if the cache was refreshed
-            if self.use_cache or self.get_option('cache'):
-                self._cache[self.cache_key][url] = results
+            self._cache[self.cache_key][url] = results
 
         return self._cache[self.cache_key][url]