use more xpath instead of fragile CSS selectors, remove non working code from combination track test
use more xpath instead of fragile CSS selectors, remove non working code from combination track test

erasche/jbrowse,Arabidopsis-Information-Portal/jbrowse,nathandunn/jbrowse,erasche/jbrowse,Arabidopsis-Information-Portal/jbrowse,nathandunn/jbrowse,erasche/jbrowse,limeng12/jbrowse,limeng12/jbrowse,Arabidopsis-Information-Portal/jbrowse,Arabidopsis-Information-Portal/jbrowse,GMOD/jbrowse,limeng12/jbrowse,limeng12/jbrowse,nathandunn/jbrowse,limeng12/jbrowse,limeng12/jbrowse,erasche/jbrowse,Arabidopsis-Information-Portal/jbrowse,GMOD/jbrowse,erasche/jbrowse,erasche/jbrowse,GMOD/jbrowse,limeng12/jbrowse,nathandunn/jbrowse,Arabidopsis-Information-Portal/jbrowse,erasche/jbrowse,Arabidopsis-Information-Portal/jbrowse,limeng12/jbrowse,GMOD/jbrowse,erasche/jbrowse,nathandunn/jbrowse,GMOD/jbrowse