Move display name rule

As per https://github.com/matrix-org/matrix-doc/pull/373 and comment

synapse/push/baserules.py

@@ -217,45 +217,49 @@ BASE_APPEND_OVERRIDE_RULES = [
             'dont_notify'
         ]
     },
-]
-
-
-BASE_APPEND_UNDERRIDE_RULES = [
+    # This was changed from underride to override so it's closer in priority
+    # to the content rules where the user name highlight rule lives. This
+    # way a room rule is lower priority than both but a custom override rule
+    # is higher priority than both.
     {
-        'rule_id': 'global/underride/.m.rule.call',
+        'rule_id': 'global/underride/.m.rule.contains_display_name',
         'conditions': [
             {
-                'kind': 'event_match',
-                'key': 'type',
-                'pattern': 'm.call.invite',
-                '_id': '_call',
+                'kind': 'contains_display_name'
             }
         ],
         'actions': [
             'notify',
             {
                 'set_tweak': 'sound',
-                'value': 'ring'
+                'value': 'default'
             }, {
-                'set_tweak': 'highlight',
-                'value': False
+                'set_tweak': 'highlight'
             }
         ]
     },
+]
+
+
+BASE_APPEND_UNDERRIDE_RULES = [
     {
-        'rule_id': 'global/underride/.m.rule.contains_display_name',
+        'rule_id': 'global/underride/.m.rule.call',
         'conditions': [
             {
-                'kind': 'contains_display_name'
+                'kind': 'event_match',
+                'key': 'type',
+                'pattern': 'm.call.invite',
+                '_id': '_call',
             }
         ],
         'actions': [
             'notify',
             {
                 'set_tweak': 'sound',
-                'value': 'default'
+                'value': 'ring'
             }, {
-                'set_tweak': 'highlight'
+                'set_tweak': 'highlight',
+                'value': False
             }
         ]
     },