Typo for Zuul triggers in '{name}-maven-checkstyle'

Does not prevent jobs from running since the Jenkins Gearman plugin does
not uses the jobs parameters but pass them directly.

Change-Id: I255fc136bacac1f2da682eebbb447fc70597cbbe
Make '{name}-maven-checkstyle' concurrent

That should be safe™.

Updates job apps-android-wikipedia-maven-checkstyle

Change-Id: I21007271fbff30c5dd2b666186611d05f621d408