[pylint] fixing enum checker (#24068)

* fixing enum checker

* extra space fix :(

scripts/pylint_custom_plugin/pylint_guidelines_checker.py

@@ -1763,7 +1763,7 @@ def visit_classdef(self, node):
                     self._enum_uppercase(node)   
             # Else if it does not have a metaclass, but it is an enum class
             # Check both capitalization and throw pylint error for metaclass
-            elif node.bases[1].name == "Enum":
+            elif node.bases[0].name == "str" and node.bases[1].name == "Enum":
                 self.add_message(
                     "enum-must-inherit-case-insensitive-enum-meta", node=node, confidence=None
                 )