Cannot see exact figures for all packages in stats when an account has too many packages

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## Summary
There is an issue with the JavaScript chart viewer for package statistics pages where it cannot show the exact figures for a date when there are too many packages. The issue is probably not the fault of ContentDB but of upstream (chart.js I think?)

##### Steps to reproduce
Go to the [mt-mods stats page](https://content.minetest.net/users/mt-mods/stats/) and hover over the chart without filtering any packages out. Notice that only about 1/3 of the packages are listed in the hover text since there are so many, and moreover those are the bottom 1/3 of packages not the top 1/3.

##### Workarounds
- Exclude packages until you have an amount visible that won't overflow
- Use your own visualisation with the JSON format data provided

##### Suggested fixes
Fixes would probably have to involve a lot of rework like forking upstream. It also works within the confines of a canvas. Still, I will provide them as ideas:
- Scrollwheel to go up and down the tooltip list
- Drawing an additional column of the list each time it overflows until they are all visible

Start at the JavaScript chart viewer used by the user stats page and reproduce the tooltip with all packages selected, using the mt-mods stats page linked in the issue. Check whether the limitation comes from chart.js; done means the tooltip exposes exact figures for every package on a date without requiring packages to be filtered out.

Written by the indexing model from the issue text.