RFR: JDK-8220678: unquarantine nsk/jdi/ThreadReference/setEnabled/setenabled003

[Gary Adams]

This trivial changeset will restore setenabled003 testing to jdk 13
where the test does not appear to be failing.

The original bug JDK-8066993 will be left open in case sustaining
team needs to apply changes in older releases.

diff --git a/test/hotspot/jtreg/ProblemList.txt 
b/test/hotspot/jtreg/ProblemList.txt
--- a/test/hotspot/jtreg/ProblemList.txt
+++ b/test/hotspot/jtreg/ProblemList.txt
@@ -158,7 +158,6 @@
  vmTestbase/nsk/monitoring/ThreadMXBean/ThreadInfo/Deadlock/JavaDeadlock001/TestDescription.java 8060733 generic-all

  vmTestbase/nsk/jdi/ThreadReference/stop/stop001/TestDescription.java 
7034630 generic-all
-vmTestbase/nsk/jdi/EventRequest/setEnabled/setenabled003/TestDescription.java 
8066993 generic-all
  vmTestbase/nsk/jdi/VirtualMachine/redefineClasses/redefineclasses021/TestDescription.java 8065773 generic-all
  vmTestbase/nsk/jdi/VirtualMachine/redefineClasses/redefineclasses023/TestDescription.java 8065773 generic-all