Expect m.room.guest_access in PartialStateJoinTest response events.

Signed-off-by: Jason Volk <jason@zemos.net>

Author: jevolk

tests/federation_room_join_test.go

@@ -553,6 +553,7 @@ func TestSendJoinPartialStateResponse(t *testing.T) {
 		"m.room.power_levels|",
 		"m.room.join_rules|",
 		"m.room.history_visibility|",
+		"m.room.guest_access|",
 		// Expect Alice and Bob's membership here because they're room heroes
 		"m.room.member|" + alice.UserID,
 		"m.room.member|" + bob.UserID,