Mk/Uses/java.mk: re-order preferred JDK (latest LTS over non-LTS)

Old order:

1. JAVA_DEFAULT
2. The oldest JDK in the JAVA_VERSION range.

New order:

1. JAVA_DEFAULT (unchanged)
2. The latest LTS from the JAVA_VERSION range is preferred over non-LTS versions.

Other existing mechanisms are unchanged. Like looking at what JDKs are already
installed.
This only affects 17 ports. (see the issue for the list)

PR: 293756