Bug 1894933 - Disable new clear history dialog due to breakage with clear on shutdown. r=pbz

Differential Revision: https://phabricator.services.mozilla.com/D209397

browser/app/profile/firefox.js

@@ -1087,7 +1087,7 @@ pref("privacy.history.custom",              false);
 // 6 - Last 24 hours
 pref("privacy.sanitize.timeSpan", 1);
 
-pref("privacy.sanitize.useOldClearHistoryDialog", false);
+pref("privacy.sanitize.useOldClearHistoryDialog", true);
 
 pref("privacy.sanitize.clearOnShutdown.hasMigratedToNewPrefs", false);
 // flag to track migration of clear history dialog prefs, where cpd stands for