partial fix for #213: setting defaults of hovermode: x for all themes #219
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Not sure what the maintainer(s) position(s) are on adapting to plotly4's new defaults are vs. maintaining the behavior of plotly3 (as much as possible) but I prefer the latter.
IMO, these edits are simply what @nicolaskruchten suggested in #213 to return the behavior of hovermode back to what it was in plotly3.