fix(ios): explicitly return null if source exists and hasn't changed #12135
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JIRA: https://jira.appcelerator.org/browse/TIMOB-28152
copyDirSync expects a return value of null, otherwise it will copy the file over. As certain files
require the contents to have been ran through _scrubiOSSourceFile, copying over the un-scrubbed file
will cause the code to become invalid and have an impact on other files causing a potential compile
time error