Bug 1845140 - Port bug 1844652: Remove "dom.serviceWorkers.enabled" from all-thunderbird.js. r=babolivier

It's now a static pref defaulting to true.

Differential Revision: https://phabricator.services.mozilla.com/D184391

--HG--
extra : moz-landing-system : lando

mail/app/profile/all-thunderbird.js

@@ -486,8 +486,6 @@ pref("browser.display.auto_quality_min_font_size", 0);
 
 pref("view_source.syntax_highlight", false);
 
-pref("dom.serviceWorkers.enabled", true);
-
 /////////////////////////////////////////////////////////////////
 // End core all.js pref overrides
 /////////////////////////////////////////////////////////////////