fix(server/views/account): Change default text of heatmap legend
fix(server/views/account): Change default text of heatmap legend

The default text of the legend is confusing given the low range of
values used. Cal-heatmap expects higher legend values, such as [10, 20,
30, 40], rather than [1, 2, 3]. This change will hopefully make the
mouseover text for the legend a little less confusing.

BREAKING CHANGE: None

Closes #16124

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