Revert "Allow v12 rooms to be created"

This reverts commit d2988096e4.

The bridge can handle v12 rooms fine, but creation requires additional considerations

Fixes #193

guildportal.go

@@ -205,6 +205,7 @@ func (guild *Guild) CreateMatrixRoom(user *User, meta *discordgo.Guild) error {
 		Preset:          "private_chat",
 		InitialState:    initialState,
 		CreationContent: creationContent,
+		RoomVersion:     "11",
 	})
 	if err != nil {
 		guild.log.Warnln("Failed to create room:", err)

portal.go

@@ -489,6 +489,7 @@ func (portal *Portal) CreateMatrixRoom(user *User, channel *discordgo.Channel) e
 		IsDirect:        portal.IsPrivateChat(),
 		InitialState:    initialState,
 		CreationContent: creationContent,
+		RoomVersion:     "11",
 	}
 	if !portal.shouldSetDMRoomMetadata() && !portal.FriendNick {
 		req.Name = ""

user.go

@@ -340,9 +340,11 @@ func (user *User) getSpaceRoom(ptr *id.RoomID, name, topic string, parent id.Roo
 		},
 		PowerLevelOverride: &event.PowerLevelsEventContent{
 			Users: map[id.UserID]int{
-				user.MXID: 50,
+				user.bridge.Bot.UserID: 9001,
+				user.MXID:              50,
 			},
 		},
+		RoomVersion: "11",
 	})
 
 	if err != nil {