Fix group investments filters links

They were pointing to the budget page instead of the budget group page,
which made navigation weird.

app/views/budgets/groups/show.html.erb

@@ -55,7 +55,7 @@
       <div class="small-12 column">
         <small>
           <%= link_to t("budgets.groups.show.unfeasible"),
-                      budget_path(@budget, filter: "unfeasible") %>
+                      budget_group_path(@budget, @group, filter: "unfeasible") %>
         </small>
       </div>
     </div>
@@ -66,7 +66,7 @@
       <div class="small-12 column">
         <small>
           <%= link_to t("budgets.groups.show.unselected"),
-                      budget_path(@budget, filter: "unselected") %>
+                      budget_group_path(@budget, @group, filter: "unselected") %>
         </small>
       </div>
     </div>

spec/system/budgets/groups_spec.rb

@@ -49,5 +49,24 @@ describe "Budget Groups" do
 
       expect(first_heading.name).to appear_before(last_heading.name)
     end
+
+    scenario "Links to investment filters", :js do
+      create(:budget_heading, group: group, name: "Southwest")
+      budget.update!(phase: "finished")
+
+      visit budget_group_path(budget, group)
+
+      click_link "See unfeasible investments"
+
+      expect(page).to have_css "h3", exact_text: "Unfeasible investments"
+      expect(page).to have_link "Southwest"
+      expect(page).not_to have_link "See unfeasible investments"
+
+      click_link "See investments not selected for balloting phase"
+
+      expect(page).to have_css "h3", exact_text: "Investments not selected for balloting phase"
+      expect(page).to have_link "Southwest"
+      expect(page).not_to have_link "See investments not selected for balloting phase unfeasible investments"
+    end
   end
 end

spec/system/budgets/investments_spec.rb

@@ -1325,10 +1325,7 @@ describe "Budget Investments" do
       expect(page).to have_css("#budget_heading_#{heading_1.id}.is-active")
       expect(page).to have_css("#budget_heading_#{heading_2.id}")
 
-      visit budget_group_path(budget, group)
-
       click_link "See unfeasible investments"
-      click_link "Health"
 
       within("#headings") do
         expect(page).to have_css("#budget_heading_#{heading_1.id}")