RFR: 8347286: (fs) Remove some extensions from java/nio/file/Files/probeContentType/Basic.java

[Brian Burkhalter]

Remove testing on Windows of file extensions which do not consistently map to the same content type across different versions of Windows.

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Commit messages:
 - 8347286: (fs) Remove some extensions from java/nio/file/Files/probeContentType/Basic.java

Changes: https://git.openjdk.org/jdk/pull/23085/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23085&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8347286
  Stats: 12 lines in 1 file changed: 0 ins; 10 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/23085.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23085/head:pull/23085

PR: https://git.openjdk.org/jdk/pull/23085