message "The current PHP memory limit is below the recommended value of 512MB." should be omitted if memory limit is unlimited (-1)

[ferdiga]

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Describe the solution you'd like

No message, if the php memory is set to unlimited = -1 , a number which is lower than 512MB

[solracsf]

This is already checked:

https://github.com/nextcloud/server/blob/03b1918c5852af63cb419a1cdf04e0ae499a0403/lib/private/MemoryInfo.php#L27