Note that in the budgets wizard test we now create district with no
associated geozone, so the text "all city" will appear in the districts
table too, meaning we can't use `within "section", text: "All city" do`
anymore since it would result in an ambiguous match.
Co-Authored-By: Julian Herrero <microweb10@gmail.com>
Co-Authored-By: Javi Martín <javim@elretirao.net>
The `map` class is applied to the map element by LeafletJS; using it in
the container led to hacks like adding an `inline` class to fix the fact
that the container was using the `height` rule of the `.map` elements.
Even though we don't add styles for them, I'm adding the `budgets-map`
and `budget-investments-map` HTML classes so these elements can still be
easily selected with CSS and JavaScript.
We're going to make a change, and it's easier if we've already got a
component with tests so we don't have to write system tests to check
whether the map is rendered.
