Bug 1752332: Rename ShouldSyncPreference to ShouldSanitizePreference r=KrisWright

This simplifies the number of negations needed,
and makes things easy to understand. I think
anyway; I know that without renaming it I made
several annoying-to-diagnose negation errors...

Depends on D141411

Differential Revision: https://phabricator.services.mozilla.com/D141412

ipc/glue/UtilityProcessManager.cpp

@@ -95,7 +95,7 @@ void UtilityProcessManager::OnPreferenceChange(const char16_t* aData) {
   NS_LossyConvertUTF16toASCII strData(aData);
 
   // A pref changed. If it is useful to do so, inform child processes.
-  if (!ShouldSyncPreference(strData.Data(), false)) {
+  if (ShouldSanitizePreference(strData.Data(), false)) {
     return;
   }