[MOD-2899] iOS: App is rejecting due to use of private symbol NSStringFromBOOL

One of customer got App rejection due to use of private symbol NSStringFromBOOL. This is getting used in appcelerator.https module. Remove that function. Apple rejection statement - ITMS-90338: Non-public API usage - The app references non-public symbols in 'App Name': _NSStringFromBOOL. If method names in your source code match the private Apple APIs listed above, altering your method names will help prevent this app from being flagged in future submissions. In addition, note that one or more of the above APIs may be located in a static library that was included with your app. If so, they must be removed. For further information, visit the Technical Support Information at http://developer.apple.com/support/technical/ Best regards, The App Store Team