xgettext: Fix parsing of XML tags that end in /> and have attributes.
Reported by Matej Marusak <marusak.matej@gmail.com>
in <https://savannah.gnu.org/bugs/?56848>.
* gettext-tools/src/x-javascript.c (phase5_get): After reading a string, reset
the lexical_context to the previous one, not to lc_outside. When reading /> at
the end of an XML element, decrement xml_element_depth.
* gettext-tools/tests/xgettext-javascript-6: Add a test.
