[gnome-sound-recorder] Fix app name in --help usage

[Felipe Borges <felipeborges src gnome org>]

commit 884b74e0db2372a75acdafade03cdae85cc15caa
Author: Elias Papavasileiou <eliaspap pm me>
Date:   Wed Jul 24 14:27:53 2019 +0300

    Fix app name in --help usage

 src/application.js | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/application.js b/src/application.js
index 5149272..1fdeea6 100644
--- a/src/application.js
+++ b/src/application.js
@@ -38,6 +38,7 @@ var Application = GObject.registerClass(class Application extends Gtk.Applicatio
     _init() {
         super._init({ application_id: pkg.name });
         GLib.set_application_name(_("SoundRecorder"));
+        GLib.set_prgname("gnome-sound-recorder");
     }
 
     _initAppMenu() {