fix(systems/github): Filter: set query parameter, instead of adding it mulitple times

ref 4f845899

src/main/java/de/hftstuttgart/unifiedticketing/systems/github/GithubFilter.java

@@ -50,7 +50,7 @@ public class GithubFilter extends Filter<GithubTicket, GithubFilter>
 
         // set default values before checking user filters,
         // to match default behaviour
-        urlBuilder.addQueryParameter("state", "all");
+        urlBuilder.setQueryParameter("state", "all");
 
         for (Map.Entry<String, Object> mapEntry : setFilters.entrySet())
         {
@@ -101,7 +101,7 @@ public class GithubFilter extends Filter<GithubTicket, GithubFilter>
                     urlBuilder.addQueryParameter("per_page", String.valueOf(v));
                 } else if (f.equals(FilterNames.OPEN.name()))
                 {
-                    urlBuilder.addQueryParameter("state", ((boolean) v) ? "open" : "closed");
+                    urlBuilder.setQueryParameter("state", ((boolean) v) ? "open" : "closed");
                 } else if (f.equals(FilterNames.TITLE_CONTAINS.name()))
                 {
                     logger.log(Level.FINE, "title contain check only possible after request |" +