triggers: correct name of JMS Messaging Plugin
triggers: correct name of JMS Messaging Plugin

The plugin's name is "JMS Messaging Plugin", and "Pipeline Plugin"
appears to be a bad copy & paste from elsewhere.

Change-Id: I3b955304fd671a95110679947228a5728480bb0e

puppetlabs/jenkins-job-builder,gforcada/jenkins-job-builder,gforcada/jenkins-job-builder,wsoula/jenkins-job-builder,puppetlabs/jenkins-job-builder,puppetlabs/jenkins-job-builder,wsoula/jenkins-job-builder,wsoula/jenkins-job-builder,puppetlabs/jenkins-job-builder,gforcada/jenkins-job-builder,gforcada/jenkins-job-builder,gforcada/jenkins-job-builder,wsoula/jenkins-job-builder