Better matching criteria for E2520 (#2886)

Author: kddejong

src/cfnlint/rules/resources/properties/Exclusive.py

@@ -38,7 +38,7 @@ def check(self, properties, exclusions, path, cfn):
                 for property_set in property_sets:
                     obj = property_set["Object"].clean()
                     for prop in obj:
-                        if prop in exclusions:
+                        if prop == k:
                             for excl_property in exclusions[prop]:
                                 if excl_property in obj:
                                     if property_set["Scenario"] is None: