Bug 1780403: Allowlist the ui. pref branch r=emilio

There's a large list of dynamic preferences in the ui. tree
but none of them should contain personally identifiable data.

Differential Revision: https://phabricator.services.mozilla.com/D152340

modules/libpref/Preferences.cpp

@@ -5895,7 +5895,7 @@ static const PrefListEntry sDynamicPrefOverrideList[]{
     PREF_LIST_ENTRY("type.String."),
     PREF_LIST_ENTRY("toolkit.mozprotocol.url"),
     PREF_LIST_ENTRY("toolkit.telemetry.log.level"),
-    PREF_LIST_ENTRY("ui.-moz-fieldtext.dark"),
+    PREF_LIST_ENTRY("ui."),
 };
 
 #undef PREF_LIST_ENTRY