FIX selecting price type

selecting the wanted index doesn't trigger a change event which is necessary to update  internal variables regarding the price type

src/kleinanzeigen_bot/web_scraping_mixin.py

@@ -552,6 +552,7 @@ class WebScrapingMixin:
                 {{
                   if(element.options[i].value == "{selected_value}") {{
                     element.selectedIndex = i;
+                    element.dispatchEvent(new Event('change', {{ bubbles: true }}));
                     break;
                 }}
               }}