[polari] ircParser: Fix /help

[Florian Müllner <fmuellner src gnome org>]

commit b6839383bfe80b49ffc525377d921abfece529b7
Author: Florian Müllner <fmuellner gnome org>
Date:   Tue Aug 24 03:44:10 2021 +0200

    ircParser: Fix /help
    
    Eeeks, some fallout from commit 07edc92510aa ...
    
    https://gitlab.gnome.org/GNOME/polari/-/merge_requests/216

 src/ircParser.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/ircParser.js b/src/ircParser.js
index fa43fd08..276e2f0b 100644
--- a/src/ircParser.js
+++ b/src/ircParser.js
@@ -60,7 +60,7 @@ export default class IrcParser {
     }
 
     _createFeedbackUsage(cmd) {
-        return vprintf(this._createFeedbackLabel(_('Usage: %s'), _(knownCommands[cmd])));
+        return this._createFeedbackLabel(vprintf(_('Usage: %s'), _(knownCommands[cmd])));
     }
 
     _createFeedbackGrid(header, items) {