RFR: 8274171: java/nio/file/Files/probeContentType/Basic.java failed on "Content type" mismatches

[Julia Boes]

This is a small follow-up to a recent update of the content-type.properties files [1]. The test fails on certain linux-x64 boxes, where the expected content type differs.

Testing: tier 1-3, plus 1k runs of test in question 

[1] https://bugs.openjdk.java.net/browse/JDK-8273655

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Commit messages:
 - initial change

Changes: https://git.openjdk.java.net/jdk/pull/5656/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5656&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8274171
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5656.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5656/head:pull/5656

PR: https://git.openjdk.java.net/jdk/pull/5656