[foreign-jextract] RFR: 8242288: Sample code has to be adjusted after recent changes in jextract generated code

[Athijegannathan Sundararajan]

fixed to use getters.

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Commit messages:
 - 8242288: Sample code has to be adjusted after recent changes in jextract generated code

Changes: https://git.openjdk.java.net/panama-foreign/pull/105/files
 Webrev: https://webrevs.openjdk.java.net/panama-foreign/105/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8242288
  Stats: 299 lines in 2 files changed: 40 ins; 2 del; 257 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/105.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/105/head:pull/105

PR: https://git.openjdk.java.net/panama-foreign/pull/105