RFR: 8261758: [TESTBUG] gc/g1/TestGCLogMessages.java fails if ergonomics detect too small InitialHeapSize

[Christoph Göttschkes]

Adds an explicit -Xms to one part of the test case, to not rely on ergonomics to detect the correct InitialHeapSize.

It looks like one part of the whole test case implicitly relied on the fact, that `InitialHeapSize` == `MaxHeapSize`. Since the `MaxHeapSize` is very small (32M), this is almost always true. But if the test device has less than 2G of memory, the ergonomics configure the `InitialHeapSize` to be smaller than the `MaxHeapSize`.

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Commit messages:
 - Fixes indention.
 - Adds -Xms = -Xmx to not rely on ergonomics.

Changes: https://git.openjdk.java.net/jdk/pull/2577/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2577&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8261758
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2577.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2577/head:pull/2577

PR: https://git.openjdk.java.net/jdk/pull/2577