Fix cliping problems in room list when using multiple accounts

Before the rooms from the room list would go above the account selector,
making it not possible to switch accounts and creating weird visual
artifacts.

imports/NeoChat/Page/RoomListPage.qml

@@ -109,6 +109,7 @@ Kirigami.ScrollablePage {
         id: listView
 
         activeFocusOnTab: true
+        clip: accountList.count > 1
 
         Kirigami.PlaceholderMessage {
             anchors.centerIn: parent