bar: update criteria for 'textposition: 'auto'`
bar: update criteria for 'textposition: 'auto'`

* 'auto' will draw a label inside a bar if larger than drawn outside.

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