2 remaining references to plottable pie

[Brian Lewis]

pineapples\Pineapples\Views\default\School\SchoolDashboard.cshtml(19):

pineapples\Pineapples\Views\default\SchoolAccreditation\Dashboard\Component\NationPie.cshtml(47):

[Brian Lewis]

It turns out the NationPie was not used, although it was in the typescript build.

However, rather than modify it, because RowColChart can now render in Pie formats as well as bars and columns, it was easier to begin with the existing NationCharts and make some minor tweaks.

‌

[Ghislain Hachey]

Duplicate of #845.