Fix a bug where SIG API spots could be re-tagged as another SIG e.g. WAB if that was named in the comment.

spotproviders/wwbota.py

@@ -29,6 +29,7 @@ class WWBOTA(SSESpotProvider):
                     freq=float(source_spot["freq"]) * 1000000,
                     mode=source_spot["mode"].upper(),
                     comment=source_spot["comment"],
+                    sig="WWBOTA",
                     sig_refs=refs,
                     time=datetime.fromisoformat(source_spot["time"]).timestamp(),
                     # WWBOTA spots can contain multiple references for bunkers being activated simultaneously. For