RFR(XXS): 8217520: Remove vm.opt.MaxGCPauseMillis == "null" from TestOldGenCollectionUsage.java

[Hohensee, Paul]

Please review this small cleanup.

JBS: https://bugs.openjdk.java.net/browse/JDK-8217520
Webrev: http://cr.openjdk.java.net/~phh/8217520/webrev.00/

This change is in response to a comment by Thomas as part of a review of the backport of JDK-8195115 to jdk8u. See

https://mail.openjdk.java.net/pipermail/hotspot-gc-dev/2019-January/024570.html

Thanks,

Paul

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