Fix websocket URL to work with both clearnet and onion

frontend/src/app/services/api.service.ts

@@ -6,7 +6,10 @@ import { Observable } from 'rxjs';
 import { MemPoolService } from './mem-pool.service';
 import { tap, retryWhen, delay } from 'rxjs/operators';
 
-const WEB_SOCKET_URL = 'ws://' + document.location.hostname + '/ws';
+let WEB_SOCKET_PROTOCOL = 'wss://';
+if (document.location.hostname.indexOf('onion') != -1)
+       WEB_SOCKET_PROTOCOL = 'ws://'
+const WEB_SOCKET_URL = WEB_SOCKET_PROTOCOL + document.location.hostname + '/ws';
 const API_BASE_URL = '/api/v1';
 
 @Injectable({