fix selenium embedded mode test for recent track label de-dotting
fix selenium embedded mode test for recent track label de-dotting

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