Fix ProblemList.txt for sun/tools/jhsdb/HeapDumpTestWithActiveProcess.java

There are two errors with the sun/tools/jhsdb/HeapDumpTestWithActiveProcess.java entry. First of all, there are two separate entries:

sun/tools/jhsdb/HeapDumpTestWithActiveProcess.java 8230731,8001227 windows-all
sun/tools/jhsdb/HeapDumpTestWithActiveProcess.java 8231635,8231634 generic-all

At the time it was thought that jtreg would combine these since it seemed to work, but it looks like what jtreg actually does is just take the last entry it sees. Since it this case it was "generic-all" it still ended up doing the right thing, but we shouldn't rely on jtreg ordering logic for that to happen. The two lines should be combined.

The second issue is that JDK-8231635 is fixed, so it's entry should be removed.