Remove test from problem list as the bug is fixed

Author: jerboaa

test/hotspot/jtreg/ProblemList.txt

@@ -123,7 +123,6 @@ applications/jcstress/copy.java 8229852 linux-all
 containers/docker/TestJcmd.java 8278102 linux-all
 containers/docker/TestMemoryAwareness.java 8303470 linux-all
 containers/docker/TestJFREvents.java 8327723 linux-x64
-containers/systemd/SystemdMemoryAwarenessTest.java 8322420 linux-all
 
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