Final fix for typo in autoCompleteDelimChar attribute name

Commit 3f1f53f2 introduced autocompletion for label expression text
box on project configuration page. But with a typo in a textbox's
attribute in configure-common.jelly and hudson-behavior.js.

Commit 39a93420 fixed this typo in hudson-behavior.js, this one fixes
other part in configure-common.jelly.