fix(crawler): Fix invalid calculation of number of first vaccinations

Numbers for second shot are actually inclusive of booster
shots, so booster shots do not
have to be subtracted from the
total number of vaccinations.

Fixes #10.

custom_components/home_assistant_covid19_augsburg/crawler.py

@@ -187,8 +187,8 @@ class CovidCrawler(CovidCrawlerBase):
         if not matches:
             raise ValueError(f"Could not extract date from scraped web page, {text=}")
 
-        values["num_vaccinated_once"] = values["total_vaccinations"] - (
+        values["num_vaccinated_once"] = (
-            values["num_vaccinated_full"] + values["num_vaccinated_booster"]
+            values["total_vaccinations"] - values["num_vaccinated_full"]
         )
 
         values["date"] = parse_date(**matches.groupdict()).strftime("%Y-%m-%d")