Fix : heatmap for maxconf

[alexbelgium]

Hi, while playing with the daily plot, I found what I think is a bug.

The heatmap does not show the maxconf of a species (as the code indicates should be) but the confidence of the latest detection. If we build a dictionary first it solves the issue and only show the max confidence

For example my troglodyte is at max conf of 100% for that day.

Before :

After :

[Nachtzuster]

I guess so? I can't say I understand daily_plot.py very well 😄

[alexbelgium]

Thanks! Ahah I don't understand it that much either but I had noticed that the colors where changing too often for what should be a max conf... I did some trials and errors until I found the way that had the expected bahavior with the minimum code change...