fix: 00081190 missing DICOMWEB_API

# Problems
- http://127.0.0.1:8081/raccoon/studies/ that
missing `DICOMWEB_API`: "dicom-web"
- Correct is  http://127.0.0.1:8081/raccoon/dicom-web/studies/

# Solutions
- Add `DICOMWEB_API` to pathname in baseURL

models/DICOMWeb/index.js

@@ -10,7 +10,7 @@ function getBasicURL () {
     let port = process.env.DICOMWEB_PORT;
     let hostnameSplit = _.compact(process.env.DICOMWEB_HOST.split("/"));
     let hostname = hostnameSplit.shift();
-    let pathname = hostnameSplit.join("/");
+    let pathname = [...hostnameSplit, ...process.env.DICOMWEB_API.split("/")].join("/");
     let basicUrlObj = new urlObj.URL(`${protocol}://${hostname}`);
     basicUrlObj.port = port;
     basicUrlObj.pathname = pathname;