Prioritize alternate charset when de-translating SSIDs

The alternate charset is prioritized when translating SSIDs, so
prioritize it when detranslating SSIDs in
SsidTranslator.getOriginalSsid() for consistency.

Bug: 283216966
Test: atest SsidTranslatorTest
Change-Id: I8cf404529450bb628c4d34c34b4300e2e2b73bc4
2 files changed