Update MSC3786 implementation: Check the state_key (#2429)

spec/unit/pushprocessor.spec.js

@@ -302,6 +302,7 @@ describe('NotificationService', function() {
             type: EventType.RoomServerAcl,
             room: testRoomId,
             user: "@alfred:localhost",
+            skey: "",
             event: true,
             content: {},
         });

src/pushprocessor.ts

@@ -83,6 +83,11 @@ const DEFAULT_OVERRIDE_RULES: IPushRule[] = [
                 key: "type",
                 pattern: EventType.RoomServerAcl,
             },
+            {
+                kind: ConditionKind.EventMatch,
+                key: "state_key",
+                pattern: "",
+            },
         ],
         actions: [],
     },