Fix heatmap first color being unused #22158
Merged
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Backport #22157. vue3-calendar-heatmap has the behaviour that the first and second colors are mapped to values null and 0, meaning the second color was not used as intended for values > 0. I think this is a behaviour change from previous vue2 version that was missed during the upgrade.
This change makes first and second values the same, so the heatmap can now use one additional color for meaningful values.