Do not bump clfs on seq mismatch when before stream LastSeq (#5821)

Sometimes during a stream catchup after a restart, when applying entries
the clfs could have been bumped due to msg not found errors from likely
deleted messages, causing a stream replica to remain out of sync.

Fixes #5205

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Signed-off-by: Waldemar Quevedo <wally@nats.io>
Signed-off-by: Derek Collison <derek@nats.io>
Co-authored-by: Derek Collison <derek@nats.io>