Don't overflow room name

resources/qml/TopBar.qml

@@ -68,6 +68,8 @@ Rectangle {
             color: colors.text
             font.pointSize: fontMetrics.font.pointSize * 1.1
             text: room ? room.roomName : qsTr("No room selected")
+            maximumLineCount: 1
+            elide: Text.ElideRight
 
             MouseArea {
                 anchors.fill: parent