RFR: 8261661: gc/stress/TestReclaimStringsLeaksMemory.java fails because Reserved memory size is too big

[Daniel D.Daugherty]

A trivial fix to adjust a test to work with the fix from:

https://bugs.openjdk.java.net/browse/JDK-8261297 NMT: Final report should use scale 1

The idea for the fix came from @albertnetymk. Thanks!
The failure reproduces on my local MBP13 and does not reproduce
with this fix in place.

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Commit messages:
 - 8261661: gc/stress/TestReclaimStringsLeaksMemory.java fails because Reserved memory size is too big

Changes: https://git.openjdk.java.net/jdk/pull/2557/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2557&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8261661
  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2557.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2557/head:pull/2557

PR: https://git.openjdk.java.net/jdk/pull/2557