[polari] app: Fix help URL

[Florian Müllner <fmuellner src gnome org>]

commit 33dddfbd7775fb9133b5dd27b2bee4ce497290bb
Author: Florian Müllner <fmuellner gnome org>
Date:   Tue Jan 28 00:10:21 2020 +0100

    app: Fix help URL
    
    Commit 475d9a1b0f did not just change the translation domain used
    by help files, but also its installation location. In other words,
    it left the "Help" action broken (but hey, at least we know conform
    to some Debian rule) ...
    
    https://gitlab.gnome.org/GNOME/polari/issues/125

 src/application.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/application.js b/src/application.js
index fc41676..25a8fa9 100644
--- a/src/application.js
+++ b/src/application.js
@@ -809,7 +809,7 @@ var Application = GObject.registerClass({
     }
 
     _onShowHelp() {
-        Utils.openURL('help:org.gnome.Polari', Gtk.get_current_event_time());
+        Utils.openURL('help:polari', Gtk.get_current_event_time());
     }
 
     _onShowAbout() {