Fix sender names not being used

src/Scylla/Model.elm

@@ -4,7 +4,7 @@ import Scylla.Room exposing (getLocalDisplayName)
 import Scylla.Sync exposing (SyncResponse, HistoryResponse)
 import Scylla.ListUtils exposing (findFirst)
 import Scylla.Room exposing (OpenRooms)
-import Scylla.UserData exposing (UserData)
+import Scylla.UserData exposing (UserData, getSenderName)
 import Scylla.Sync.Rooms exposing (JoinedRoom)
 import Scylla.Sync.Push exposing (Ruleset)
 import Scylla.Sync.AccountData exposing (AccountData, directMessagesDecoder)
@@ -93,4 +93,4 @@ roomLocalDisplayName : Model -> RoomId -> Username -> String
 roomLocalDisplayName m rid u =
     case Dict.get rid m.rooms of
         Just rd -> getLocalDisplayName rd u
-        _ -> u
+        _ -> getSenderName u

src/Scylla/Room.elm

@@ -2,6 +2,7 @@ module Scylla.Room exposing (..)
 import Scylla.Route exposing (RoomId)
 import Scylla.Sync exposing (SyncResponse)
 import Scylla.Login exposing (Username)
+import Scylla.UserData exposing (getSenderName)
 import Scylla.Sync exposing (HistoryResponse)
 import Scylla.Sync.Events exposing (MessageEvent, StateEvent, toStateEvent, toMessageEvent)
 import Scylla.Sync.AccountData exposing (AccountData, getDirectMessages, applyAccountData)
@@ -147,7 +148,7 @@ getRoomName ad rid rd =
 getLocalDisplayName : RoomData -> Username -> String
 getLocalDisplayName rd u =
     getStateData ("m.room.member", u) (field "displayname" string) rd
-    |> Maybe.withDefault u
+    |> Maybe.withDefault (getSenderName u)
 
 getNotificationCount : RoomData -> (Int, Int)
 getNotificationCount rd =

src/Scylla/UserData.elm

@@ -15,11 +15,6 @@ userDataDecoder =
         |> optional "displayname" (Decode.map Just string) Nothing
         |> optional "avatar_url" (Decode.map Just string) Nothing
 
-getDisplayName : Dict Username UserData -> Username -> String
-getDisplayName ud s = Dict.get s ud
-    |> Maybe.andThen .displayName 
-    |> Maybe.withDefault (getSenderName s) 
-
 getSenderName : Username -> String
 getSenderName s =
     let