RFR: JDK-8308156: VerifyCACerts.java misses blank in error output

[Matthias Baesken]

In the checksum-related check, we miss blanks in the error output of the calculated and expected checksum.

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Commit messages:
 - JDK-8308156

Changes: https://git.openjdk.org/jdk/pull/14003/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14003&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8308156
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/14003.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14003/head:pull/14003

PR: https://git.openjdk.org/jdk/pull/14003