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/hema.py

@@ -53,6 +53,7 @@ class HEMA(HTTPSpotProvider):
                                 freq=float(freq_mode_match.group(1)) * 1000000,
                                 mode=freq_mode_match.group(2).upper(),
                                 comment=spotter_comment_match.group(2),
+                                sig="HEMA",
                                 sig_refs=[SIGRef(id=spot_items[3].upper(), sig="HEMA", name=spot_items[4])],
                                 time=datetime.strptime(spot_items[0], "%d/%m/%Y %H:%M").replace(tzinfo=pytz.UTC).timestamp(),
                                 dx_latitude=float(spot_items[7]),