Fix regression is retrieving sc code (#3453)

I broke the code when I fixed this.  The old codepath did some trimming
of the sc value and I didn't kill that line, so the value was being
clipped.

This fixes #3430 and is confirmed working on a live instance.

searx/engines/startpage.py

@@ -91,14 +91,13 @@ def get_sc_code(headers):
         dom = html.fromstring(resp.text)
 
         try:
-            href = eval_xpath(dom, '//input[@name="sc"]')[0].get('value')
+            sc_code = eval_xpath(dom, '//input[@name="sc"]')[0].get('value')
         except IndexError as exc:
             # suspend startpage API --> https://github.com/searxng/searxng/pull/695
             raise SearxEngineResponseException(
                 suspended_time=7 * 24 * 3600, message="PR-695: query new sc time-stamp failed!"
             ) from exc
 
-        sc_code = href[5:]
         sc_code_ts = time()
         logger.debug("new value is: %s", sc_code)