[TieredStorage] Disable accounts-file type check before enabling tiered-storage #418
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Problem
As #72 introduced AccountsFile::TieredStorage, it also performs
file-type check when opening an accounts-file to determine whether
it is a tiered-storage or an append-vec. But before tiered-storage is
enabled, this opening check is unnecessary.
Summary of Changes
Remove the accounts-file type check code and simply assume everything
is append-vec on AccountsFile::new_from_file().