The interface was a bit confusing, since after clicking on "See
unfeasible investments" (or similar), we were on a page where no
investments were shown.
Besides, since commit 7e3dd47d5, the group page is only linked from the
"my ballot" page, through a link inviting the user to vote in that
group, and it's only possible to vote selected investments (which is the
default filter during the final voting phase).
The only reason we had these links here was these links weren't present
in the investments page. But they're present there since commit
04605d5d5, so we don't need them in the group page anymore.
When render the investment list component with the link "see all
investments", now we redirect to groups index page when a budget has
multiple headings.
We were defining the same filters in three different controllers. We
were also adding a method in the ApplicationController which only made
sense in the same three controllers.
We were filtering by winners investments for finished budget without
having in consideration other filters.
We want the default filter to be `winners` for finished budgets.
