pw-poller: restore log section open

Commit db9c2da (pw_poller: poll events, not series, 2025-04-23)
unintentionally removed a log opening section, while deleting some
unused code. The log_open_sec() and log_end_sec() calls must be
balanced.

Signed-off-by: Jakub Kicinski <[email protected]>

Author: kuba-moo

pw_poller.py

@@ -193,6 +193,7 @@ def run(self, life) -> None:
             secs = 0
             while life.next_poll(secs):
                 req_time = datetime.datetime.now()
+                log_open_sec(f"Querying patchwork at {req_time} since {since}")
                 json_resp, since = self._pw.get_new_series(since=since)
                 log(f"Loaded {len(json_resp)} series", "")