Don't show detailed doughnut tooltip if sum is > 99.9%

[yubiuser]

What does this PR aim to accomplish?:

To decide whether some slice of the doughnut chart is hidden, we use .chart._metasets[0].total which outputs the percentage of "total shown percent". If it was >=100 we did not show the detailed doughnut tooltip.

However, even if no slice is hidden .chart._metasets[0].total returns percentages between 100.000000001 and 99.9799999, in the latter case the detailed tooltip is shown despite nothing is hidden.
To compensate the rounding issue, this PR won't show the detailed tooltip if percentage is > 99.9.

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After:

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[yubiuser]

Added a commit that will show if item percentage of total share is less then 0.1% with <0.1% instead of 0.0% as we have it now.

[pralor-bot]

This pull request has been mentioned on Pi-hole Userspace. There might be relevant details there:

https://discourse.pi-hole.net/t/up-to-date-documentation/58566/2