fix aria-label in search box (#11769)

Co-authored-by: Kevin Vuong <kevin.vuong@hrsdc-rhdcc.gc>

Author: kevin-vuong99

dojo/templates/base.html

@@ -126,7 +126,7 @@
                                 <div class="custom-search-form">
                                     <form id="custom_search_form" role="search" method="get" action="{% url 'simple_search' %}">
                                         <div class="input-group">
-                                            <input id="simple_search" label="simple_search" aria_label="simple_search" type="text" name="query" class="form-control"
+                                            <input id="simple_search" label="simple_search" aria-label="simple_search" type="text" name="query" class="form-control"
                                                 placeholder="{% trans "Search" %}..." value="{{clean_query}}">
                                             <span class="input-group-btn">
                                                 <button id="simple_search_submit" class="btn btn-primary" type="submit" aria-label="Search">