Move map location fields partial to a component

This way it'll be easier to test it and refactor it.

spec/components/map_locations/form_fields_component_spec.rb

@@ -0,0 +1,28 @@
+require "rails_helper"
+
+describe MapLocations::FormFieldsComponent do
+  let(:proposal) { Proposal.new }
+  let(:map_location) { MapLocation.new }
+  let(:form) { ConsulFormBuilder.new(:proposal, proposal, ApplicationController.new.view_context, {}) }
+  let(:label) { "Map location" }
+  let(:help) { "Add a marker" }
+  let(:component) do
+    MapLocations::FormFieldsComponent.new(form, map_location: map_location, label: label, help: help)
+  end
+
+  it "is rendered when the map feature is enabled" do
+    Setting["feature.map"] = true
+
+    render_inline component
+
+    expect(page).to be_rendered
+  end
+
+  it "is not rendered when the map feature is not enabled" do
+    Setting["feature.map"] = false
+
+    render_inline component
+
+    expect(page).not_to be_rendered
+  end
+end