Use correct wording for room list

app/src/main/java/im/vector/riotredesign/features/home/room/list/RoomListViewState.kt

@@ -59,7 +59,7 @@ typealias RoomSummaries = LinkedHashMap<RoomCategory, List<RoomSummary>>
 enum class RoomCategory(@StringRes val titleRes: Int) {
     FAVOURITE(R.string.bottom_action_favourites),
     DIRECT(R.string.bottom_action_people),
-    GROUP(R.string.bottom_action_groups),
+    GROUP(R.string.bottom_action_rooms),
     LOW_PRIORITY(R.string.low_priority_header),
     SERVER_NOTICE(R.string.system_alerts_header)
 }