Add forgotten :location to Activity form

app/views/activities/_form.html.erb

@@ -33,6 +33,10 @@
       <%= f.text_area :description, class: 'form-control' %>
     </div>
     <div class="form-group">
+      <%= f.label :location %>
+      <%= f.text_area :location, class: 'form-control' %>
+    </div>
+    <div class="form-group">
       <%= f.label :deadline %>
       <%= f.datetime_field :deadline, class: 'form-control' %>
     </div>