[FIX JENKINS-22311]: Hide the list of build parameters for pending jobs

Large number of build parameters for pending jobs (e.g. gerrit triggered job) can cause unwieldy build history. This patch hides the list of build parameters by default, and shows it when a user clicks on "(pending—Build ...)". Demo: http://jsfiddle.net/jakubczaplicki/WT88W/
I doubt this works without the jQuery plugin installed.