MnemonicCode Doesn't Implement Iterator Interface Correctly

[ccjernigan]

Running detekt points out:

kotlin-bip39/lib/src/jvmMain/kotlin/cash/z/ecc/android/bip39/Mnemonics.kt:85:53: This implementation of Iterator does not correctly implement the next() method as it doesn't throw a NoSuchElementException when no elements remain in the Iterator. [IteratorNotThrowingNoSuchElementException]

Note that the detekt baseline will suppress this warning. When implementing this change, be sure to update the detekt baseline file to remove this suppression.