always set the parent resource type to the one of the entity

there is no way those can be different, but if left unset, other code
sets it to "parents" which is obviously wrong

Closes: theforeman#1684

plugins/module_utils/foreman_helper.py

@@ -1316,8 +1316,8 @@ def __init__(self, **kwargs):
         ))[0])
 
         if 'parent' in self.foreman_spec and self.foreman_spec['parent'].get('type') == 'entity':
-            if 'resouce_type' not in self.foreman_spec['parent']:
-                self.foreman_spec['parent']['resource_type'] = self.foreman_spec['entity']['resource_type']
+            # ensure parent and entity are the same type
+            self.foreman_spec['parent']['resource_type'] = self.foreman_spec['entity']['resource_type']
             if 'failsafe' not in self.foreman_spec['parent']:
                 self.foreman_spec['parent']['failsafe'] = True
             current, parent = split_fqn(self.foreman_params[self.entity_key])