For Mp3 change adjustPaddingInPlace() so uses FileChannel like FlacTagWriter.insertUsingChunks()

[IJabz]

For Mp3 change adjustPaddingInPlace() so uses FileChannel like FlacTagWriter.insertUsingChunks(), comment says

// we cannot use channels because of bugs in the macOS implementation // when moving data within the same file

but that only refers to a bug in the shorthand approach, we can still use channels and write as chunks

[IJabz]

Fixed.