Bug 1572118 - Actually enable about:logins breach-alerts by default

Differential Revision: https://phabricator.services.mozilla.com/D42043

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

browser/app/profile/firefox.js

@@ -1763,7 +1763,6 @@ pref("signon.showAutoCompleteFooter", true);
 pref("signon.management.page.enabled", true);
 pref("signon.management.page.breach-alerts.enabled", true);
 pref("signon.management.overrideURI", "about:logins?filter=%DOMAIN%");
-pref("signon.management.page.breach-alerts.enabled", false);
 #ifdef NIGHTLY_BUILD
 // Bug 1563330 tracks shipping this by default.
 pref("signon.showAutoCompleteOrigins", true);