Replace link with button in ballot investment component

app/assets/stylesheets/budgets/ballot/investment.scss

@@ -33,6 +33,7 @@
     position: absolute;
     right: $close-icon-margin;
     top: $close-icon-margin;
+    cursor: pointer;
   }
 
   &:hover {

app/components/budgets/ballot/investment_component.html.erb

@@ -3,7 +3,7 @@
   <%= investment_price %>
 
   <% if budget.balloting? %>
-    <%= link_to delete_path,
+    <%= button_to delete_path,
                 title: t("budgets.ballots.show.remove"),
                 class: "remove-budget-investment",
                 method: :delete,

spec/system/budgets/ballots_spec.rb

@@ -379,7 +379,7 @@ describe "Ballots" do
     expect(page).to have_content("You have voted one investment")
 
     within("#budget_investment_#{investment.id}") do
-      click_link "Remove vote"
+      click_button "Remove vote"
     end
 
     expect(page).to have_current_path(budget_ballot_path(budget))
@@ -406,7 +406,7 @@ describe "Ballots" do
     end
 
     within("#sidebar #budget_investment_#{investment1.id}_sidebar") do
-      click_link "Remove vote"
+      click_button "Remove vote"
     end
 
     expect(page).to have_css("#total_amount", text: "€20,000")
@@ -436,7 +436,7 @@ describe "Ballots" do
       expect(page).to have_content("You have voted one investment")
 
       within(".ballot-list li", text: "Sully monument") do
-        click_link "Remove vote"
+        click_button "Remove vote"
       end
 
       expect(page).to have_content("You have voted 0 investments")
@@ -623,7 +623,7 @@ describe "Ballots" do
       end
 
       within("#budget_investment_#{bi1.id}_sidebar") do
-        click_link "Remove vote"
+        click_button "Remove vote"
       end
 
       expect(page).not_to have_css "#budget_investment_#{bi1.id}_sidebar"