[jdk17u-dev] RFR: 8309032: jpackage does not work for module projects unless --module-path is specified

[airsquared]

Fixes an error when trying to add additional launchers in jpackage.

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Commit messages:
 - Update LauncherData.java

Changes: https://git.openjdk.org/jdk17u-dev/pull/1717/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1717&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309032
  Stats: 17 lines in 1 file changed: 0 ins; 8 del; 9 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1717.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1717/head:pull/1717

PR: https://git.openjdk.org/jdk17u-dev/pull/1717