readyState checks for FileReaderSync methods don't make sense

[jdm]

Step 1 of each method is a check if the readyState is LOADING, but a) readyState is a FileReader concept, b) readyState does not get set by synchronous operations, c) there is no way for JS to run during the synchronous operations.

[mkruisselbrink]

Thanks, that indeed doesn't make sense. Fixed.