RFR: 8369206: jpackage should not set R/O permission on app launchers

[Alexey Semenyuk]

- Remove redundant `setWritable(true, true)` / `setReadOnly()` pair in the code updating resources of launchers on Windows

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Commit messages:
 - 8369206: jpackage should not set R/O permission on app launchers

Changes: https://git.openjdk.org/jdk/pull/28305/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28305&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8369206
  Stats: 38 lines in 1 file changed: 4 ins; 9 del; 25 mod
  Patch: https://git.openjdk.org/jdk/pull/28305.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28305/head:pull/28305

PR: https://git.openjdk.org/jdk/pull/28305