Remove obsolete HTML class in advanced filters button

The `clear` class isn't needed since commit c9f31b8e1, when we moved
this button above the regular search fields.

We're also moving the `float` property to the CSS file.

app/assets/stylesheets/admin/budget_investments/search_form.scss

@@ -1,6 +1,7 @@
 .admin-budget-investments-search-form {
   .advanced-filters {
     @include link;
+    float: $global-right;
     margin: $line-height 0;
 
     @include breakpoint(medium) {

app/components/admin/budget_investments/search_form_component.html.erb

@@ -3,7 +3,7 @@
     <%= button_tag t("admin.budget_investments.index.advanced_filters"),
                    type: :button,
                    data: { toggle: "advanced_filters" },
-                   class: "advanced-filters float-right clear" %>
+                   class: "advanced-filters" %>
   </div>
 
   <div id="advanced_filters" class="<%= advanced_menu_visibility %>" data-toggler=".hide">