When the `restore foo 0 $encoded freq 100` command and `set freq [r
object freq foo]` run in different minute timestamps (i.e., when
server.unixtime/60 changes between these operations), the assertion may
fail due to the LFU decay.
This PR updates the “RESTORE can set LFU” test to verify the actual freq
value based on minute timestamps.
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Co-authored-by: debing.sun <debing.sun@redis.com>