fix OSX post java tarball Contents dir glob

[lgatellier]

Summary

At least some tarballs now contains 2 levels of directories instead of 1, which breaks the glob matching.
e.g. /zulu8.54.0.21-ca-jdk8.0.292-macosx_aarch64/zulu-8.jdk for sdk install java 8.0.292-zulu
The problem is also present for other java versions like 11.0.25-zulu, 17.0.13-zulu or 21.0.5-zulu.

The tarball internal directory tree might have changed recently and the post-download hook haven't been modified.

Log output

% set -x ; sdk install java 8.0.292-zulu
# ...
# Truncated output
# ...
+__sdkman_post_installation_hook:10> __sdkman_echo_green 'Repackaging Java 8.0.292-zulu...'
+__sdkman_echo_green:1> __sdkman_echo 32m 'Repackaging Java 8.0.292-zulu...'
+__sdkman_echo:1> [[ true == false ]]
+__sdkman_echo:4> echo -e '\033[1;32mRepackaging Java 8.0.292-zulu...\033[0m'
Repackaging Java 8.0.292-zulu...
+__sdkman_post_installation_hook:12> mkdir -p /Users/l.gatellier/devtools/sdkman/tmp/out
+__sdkman_post_installation_hook:13> /usr/bin/env tar zxf /Users/l.gatellier/devtools/sdkman/tmp/java-8.0.292-zulu.bin -C /Users/l.gatellier/devtools/sdkman/tmp/out
__sdkman_post_installation_hook:15: no matches found: /Users/l.gatellier/devtools/sdkman/tmp/out/*/Contents

 % find tmp -name Contents
tmp/out/zulu8.54.0.21-ca-jdk8.0.292-macosx_aarch64/zulu-8.jdk/Contents