Fix label width in the management area search form

With a 50% width on medium and large screens, depending on the size of
the text and the size of the screen, the label could unnecessarily use
two rows, looking broken.

app/components/management/budgets/investments/search_component.html.erb

@@ -11,7 +11,7 @@
     </div>
   </div>
   <div class="row">
-    <div class="small-12 medium-6 column">
+    <div class="small-12 column">
       <%= check_box_tag :unfeasible, "1", params[:unfeasible].present? %>
       <%= t("admin.budget_investments.search_unfeasible") %>
     </div>