[MM-48080] Update tray icon instantly when the settings change (#2376)

* Update wording and update tray icon instantly when the settings change

* Add tests

* Include new file

.vscode/settings.json

@@ -22,6 +22,7 @@
         "FOCALBOARD",
         "gsettings",
         "ICONNAME",
+        "inputflash",
         "loadscreen",
         "mmjstool",
         "NOSERVERS",
@@ -29,6 +30,7 @@
         "officedocument",
         "openxmlformats",
         "presentationml",
+        "showunreadbadge",
         "spreadsheetml",
         "textbox",
         "UNCLOSEABLE",