Correctly read the header of APK-embedded dicts

...com/android/inputmethod/latin/BinaryDictionaryGetter.java

...id/inputmethod/latin/makedict/BinaryDictDecoderUtils.java

...android/inputmethod/latin/makedict/BinaryDictIOUtils.java

...rc/com/android/inputmethod/latin/makedict/FormatSpec.java

...m/android/inputmethod/latin/makedict/Ver2DictDecoder.java

...roid/inputmethod/latin/BinaryDictionaryDecayingTests.java

...tmethod/latin/makedict/BinaryDictDecoderEncoderTests.java

...roid/inputmethod/latin/makedict/Ver2DictDecoderTests.java

.../inputmethod/latin/dicttool/BinaryDictOffdeviceUtils.java

...m/android/inputmethod/latin/dicttool/DictionaryMaker.java

...tmethod/latin/dicttool/BinaryDictOffdeviceUtilsTests.java