Show the remote session indicator only during a remote session (#14981)

Hovering the indicators revealed it dimmed alongside the ones that can be
switched on, though there is nothing to do with it there. An indicator can
now opt out of that reveal, and remote session does.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

shell/plugins/bar/indicators/RemoteSession.qml

@@ -10,11 +10,10 @@ BarIndicator {
 
   active: remoteSessionService ? remoteSessionService.active : false
   activeText: "󰢹"
-  inactiveText: "󰢹"
   activeTooltipText: peers.length > 0 ? "Remote session from " + peers.join(", ") : "Remote session"
-  inactiveTooltipText: "Remote Session"
   useActiveColor: true
   activeColor: Commons.Color.urgent
+  revealWhenInactive: false
 
   Connections {
     target: root.indicatorHost