objc: TwitterTextTests.m: silence NSUInteger format warnings
objc: TwitterTextTests.m: silence NSUInteger format warnings

using (unsigned long) cast, since the normally recommended Xcode use
of %tu is actually non-standard, and since it's just numeric
representation in XCTFail error messages text

twitter/twitter-text,twitter/twitter-text,twitter/twitter-text,twitter/twitter-text,twitter/twitter-text