fix: fixing tooltip for expanded area chart

[michellethomas]

🐛 Bug Fix

This PR added functionality for more data in the area chart rich tooltip, but those calculations don't make sense for the expanded chart. The expanded chart tooltip already shows % of total values and doesn't have a total line item. generateAreaChartTooltipContent shouldn't be called for expand stacked style.

@graceguo-supercat @etr2460

[codecov]

Codecov Report

Merging #134 into master will not change coverage.
The diff coverage is n/a.

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##           master     #134   +/-   ##
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  Coverage   19.87%   19.87%           
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  Files           8        8           
  Lines         161      161           
  Branches       10       10           
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  Hits           32       32           
  Misses        128      128           
  Partials        1        1

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[etr2460]

How does this look when you click one of the items in the legend? In the current behavior, I think the tooltip has additional information when you unselect series from the chart

[michellethomas]

expanded:

stacked:

It's not super necessary to show the 100% on the stacked chart but it's not incorrect so it seems ok.

[etr2460]

Sorry, I meant when a subset of series are selected, like this:

The percents there provide additional information as the fraction of the selected series that each individual series makes up.

[michellethomas]

Oh I see, it just adjusts the %:

[etr2460]

lgtm