Do not use the wizard component when edit phases

Currently we were using the wizard component to edit a
phase when we were no longer in the wizard.

This was a bit strange, as it took us out of the context
and showed us information such as the
CreationTimelineComponent or the HelpComponent
that is meant for when navigating the Wizard.

app/views/admin/budget_phases/edit.html.erb

@@ -1 +1,7 @@
-<%= render Admin::BudgetsWizard::Phases::EditComponent.new(@phase) %>
+<%= back_link_to admin_budget_path(@budget) %>
+
+<h2><%= @budget.name %></h2>
+
+<h3><%= "#{t("admin.budget_phases.edit.title")} - #{@phase.name}" %></h3>
+
+<%= render "form" %>

spec/system/admin/budget_phases_spec.rb

@@ -37,7 +37,7 @@ describe "Admin budget phases" do
         within("tr", text: "Accepting projects") { click_link "Edit" }
       end
 
-      expect(page).to have_css "h2", exact_text: "Edit phase - Accepting projects"
+      expect(page).to have_css "h3", exact_text: "Edit phase - Accepting projects"
 
       fill_in "Name", with: "My phase custom name"
       click_button "Save changes"