Use ruff linter to fix issues and provide consistent formatting

core/sig_lookup_helper.py

@@ -1,6 +1,6 @@
 import logging
 
-from pyhamtools.locator import locator_to_latlong, latlong_to_locator
+from pyhamtools.locator import latlong_to_locator, locator_to_latlong
 
 from core.data_store import DATA_STORE
 from core.geo_utils import wab_wai_square_to_lat_lon
@@ -83,7 +83,7 @@ def get_sig_ref_info(sig, ref_id):
         else:
             # Maybe a super new reference we don't know about yet, but more likely a typo or a test reference,
             # just silently ignore it.
-            logging.debug("%s database did not contain data for ref %s", sig, ref_id)
+            logging.debug(f"{sig} database did not contain data for ref {ref_id}")
 
     except Exception:
         logging.exception(f"Exception when looking up sig_ref info for {sig} ref {ref_id}")