Fix logical error in cache eviction

[sinaa]

While testing the edge-flags sdk with some unit tests, I came to notice that the cache is never working.

Turned out that this was due to a logical error in the cache eviction condition.

Equality has a higher precedence, and the direction of the validation operation was in the wrong direction (i.e., we want to check if now() has gone past the creation date + ttl).

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[ytkimirti]

You are right, thanks a lot for the fix ❤️