test: update hover tests in bar_test
test: update hover tests in bar_test

* Updated hover tests in bar_test to test that hover labels honor bar
  bases.

etpinard/plotly.js,etpinard/plotly.js,plotly/plotly.js,aburato/plotly.js,plotly/plotly.js,plotly/plotly.js,asolagmbh/plotly.js,etpinard/plotly.js,plotly/plotly.js,asolagmbh/plotly.js,iongroup/plotly.js,iongroup/plotly.js,aburato/plotly.js,iongroup/plotly.js,asolagmbh/plotly.js