a way to fix class-file-navigation limitations

[jixiuf]

https://github.com/yveszoundi/eglot-java/blob/main/eglot-java.el#L1440 how about just change this line to

         (cache-dir (expand-file-name ".eglot-java" (project-root (project-current))))

this shoule fix class-file-navigation limitations

After visiting an initial “class contents buffer”, further type definition navigation is not supported.