fix typo in DIGEST-MD5 charset

Fixes:32404412
Test: adb shell am instrument -w \
-e class com.android.phone.common.mail.store.imap.DigestMd5UtilsTest \
com.android.phone.tests/android.support.test.runner.AndroidJUnitRunner

Change-Id: If8c9f822d61e5091b0aaec00ef5fa8ab1596b86e
2 files changed