[Misc] Removing bad "--add-opens" (java.concurrent doesn't exist, it's...

[Misc] Removing bad "--add-opens" (java.concurrent doesn't exist, it's java.util.concurrent), already covered by the open on "java.util"

xwiki-platform-tools/xwiki-platform-tool-jetty/xwiki-platform-tool-jetty-resources/src/main/resources/start_xwiki.sh

@@ -220,8 +220,7 @@ fi
 if [ "$JAVA_VERSION" -gt 11 ]; then
   XWIKI_OPENS_LANG="--add-opens java.base/java.lang=ALL-UNNAMED"
   XWIKI_OPENS_UTIL="--add-opens java.base/java.util=ALL-UNNAMED"
-  XWIKI_OPENS_CONCURRENT="--add-opens java.base/java.concurrent=ALL-UNNAMED"
-  XWIKI_OPTS="$XWIKI_OPENS_LANG $XWIKI_OPENS_UTIL $XWIKI_OPENS_CONCURRENT $XWIKI_OPTS"
+  XWIKI_OPTS="$XWIKI_OPENS_LANG $XWIKI_OPENS_UTIL $XWIKI_OPTS"
 fi
 
 # We save the shell PID here because we do an exec below and exec will replace the shell with the executed command