Update scrapy/http/request/form.py

Co-authored-by: Adrián Chaves <adrian@chaves.io>

scrapy/http/request/form.py

@@ -204,7 +204,7 @@ def _get_clickable(clickdata, form):
 
     # We didn't find it, so now we build an XPath expression out of the other
     # arguments, because they can be used as such
-    xpath = './/*' + ''.join(f'[@{key}="{clickdata[key]}"]' for key in clickdata)
+    xpath = './/*' + ''.join(f'[@{k}="{v}"]' for k, v in clickdata.items())
     el = form.xpath(xpath)
     if len(el) == 1:
         return (el[0].get('name'), el[0].get('value') or '')