Fix collapsing account with keyboard

When collapsing the account and the current page/focus is a room of this
account, switch focus to the account.

src/qml/SidePane/SidePaneList.qml

@@ -88,6 +88,7 @@ HListView {
             {
                 currentIndex = i
                 currentItem.item.toggleCollapse()
+                activate()
             }
         }
     }