fix: restore missing <select id='pricing-location'> opening tag

The <select> element for location was missing its opening tag,
causing document.getElementById('pricing-location') to return null
in hireAgent(). This broke the 'Continue with Stripe' button.

index.html

@@ -2703,6 +2703,7 @@
                     <option value="monthly" selected>Monthly</option>
                     <option value="yearly">Yearly</option>
                 </select>
+                <select class="pricing-config-select" id="pricing-location">
                         <option value="france">France</option>
                     </select>
                     <input