Use more appropriate icons and tooltips for the room info drawer handles

Right now they use the standard text but left and right arrow icons,
which is a bit odd, and I think fails to convey what will happen when
clicked especially whern the drawer is closed.

Instead, let's use descriptive tooltip text for both, and a descriptive
icon for the the "this will open the drawer" handle button. For the one
to close the drawer, the default icon seems better, so let's stop
overriding it.

(cherry picked from commit 9d6ba324fb)

src/qml/Main.qml

@@ -162,8 +162,11 @@ Kirigami.ApplicationWindow {
 
         connection: root.connection
 
-        handleOpenIcon.source: "arrow-right"
-        handleClosedIcon.source: "arrow-left"
+        handleClosedIcon.source: "documentinfo-symbolic"
+        handleClosedToolTip: i18nc("@action:button", "Show Room Information")
+
+        // Default icon is fine, only need to override the tooltip text
+        handleOpenToolTip: i18nc("@action:button", "Close Room Information Drawer")
 
         // Connect to the onClicked function of the RoomDrawer handle button
         Connections {