jmol-applet: fix installation path

$JAVA_PKG_SHAREPATH is only set after java-pkg_init_paths_ was called,
either directly or indirectly by other functions within
java-utils-2.eclass. Missing java-pkg_init_paths_ causes jmol-applet to
be installed in / rather than /usr/share/jmol-applet/.

Package-Manager: portage-2.2.8-r1