xgettext: Java: Remove unjustified warning "'}' found where ')' was expected".

xgettext: Java: Remove unjustified warning "'}' found where ')' was expected".

Reported by Alexander Hubmann-Haidvogel <ahubmann@gmail.com> in
<https://lists.gnu.org/archive/html/bug-gettext/2025-09/msg00000.html>
and by Bjoern Voigt <bjoernv@arcor.de> in
<https://lists.gnu.org/archive/html/bug-gettext/2025-09/msg00023.html>.

* gettext-tools/src/x-java.c (extract_parenthesized): When a semicolon is seen
inside braces, start a new argparser instead of returning.
* gettext-tools/tests/xgettext-java-1: Add test cases with inner classes.