feat(servarr): auto fill base url when testing service if missing (#1995)

* feat(servarr): auto fill base url when testing service if missing

This will fill the base URL of the *arr service only if it's missing and the base URL hasn't been
provided beforehand

* fix(servarr): replace redundant check

* fix(servarr): suggested changes

src/components/Settings/RadarrModal/index.tsx

@@ -82,6 +82,7 @@ interface TestResponse {
     id: number;
     label: string;
   }[];
+  urlBase?: string;
 }
 
 interface RadarrModalProps {
@@ -317,6 +318,9 @@ const RadarrModal: React.FC<RadarrModalProps> = ({
                     port: values.port,
                     useSsl: values.ssl,
                   });
+                  if (!values.baseUrl || values.baseUrl === '/') {
+                    setFieldValue('baseUrl', testResponse.urlBase);
+                  }
                 }
               }}
               secondaryDisabled={