RFR: 8286115: G1: G1RemSetArrayOfCardsEntriesBase off-by-one error

[Albert Mingkun Yang]

Simple fix for an off-by-one error around the G1 remset array container capacity.

Test: tier1, manually verifying `-XX:+PrintFlagsFinal` prints the correct value

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Commit messages:
 - g1remset-off-by-1

Changes: https://git.openjdk.java.net/jdk/pull/8531/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8531&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8286115
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8531.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8531/head:pull/8531

PR: https://git.openjdk.java.net/jdk/pull/8531