fix(ipc): added missing entry to Control settingsTabMap

fixed the following call by adding the missing idle entry

```
qs -c noctalia-shell ipc call settings openTab idle
```

Author: Mondotosz

Services/Control/IPCService.qml

@@ -104,7 +104,8 @@ Singleton {
                                             "system": SettingsPanel.Tab.System,
                                             "systemmonitor": SettingsPanel.Tab.System,
                                             "userinterface": SettingsPanel.Tab.UserInterface,
-                                            "wallpaper": SettingsPanel.Tab.Wallpaper
+                                            "wallpaper": SettingsPanel.Tab.Wallpaper,
+                                            "idle": SettingsPanel.Tab.Idle
                                           })
 
   function _parseSettingsTabArg(tabArg) {