fix: FilterAttributeValues: use re.fullmatch, remove unnecessary compile

... as per review in #432

Author: vladimir-mencl-eresearch

src/satosa/micro_services/attribute_modifications.py

@@ -81,7 +81,7 @@ def _shibmdscope_match_value(self, value, md_scopes):
         for md_scope in md_scopes:
             if not md_scope['regexp'] and md_scope['text'] == value:
                 return True
-            elif md_scope['regexp'] and re.compile(md_scope['text']).match(value):
+            elif md_scope['regexp'] and re.fullmatch(md_scope['text'], value):
                 return True
         return False