unified hoverlabel: do not process MathJax in hover since it's not supported
unified hoverlabel: do not process MathJax in hover since it's not supported

without this fix, in mock "ohlc_first", the library tries to render MathJax
and the result is broken

plotly/plotly.js,plotly/plotly.js,aburato/plotly.js,aburato/plotly.js,etpinard/plotly.js,plotly/plotly.js,etpinard/plotly.js,plotly/plotly.js,etpinard/plotly.js