Fix overlapping elements on job page (#667)

Author: timja

src/main/resources/io/jenkins/plugins/pipelinegraphview/multipipelinegraphview/MultiPipelineGraphViewAction/jobMain.jelly

@@ -2,6 +2,8 @@
 <?jelly escape-by-default='true'?>
 <j:jelly xmlns:j="jelly:core" xmlns:l="/lib/layout">
   <j:if test="${it.showGraphOnJobPage}">
+    <!-- workaround floatingBox elements overlapping until page is reworked -->
+    <div class="clearfix" />
     <l:card title="${%Stages}" expandable="multi-pipeline-graph">
       <div id="multiple-pipeline-root"
            data-current-job-path="${rootURL + '/' + it.jobUrl}"