Small Ui fixes in Qr-Code Scanner

packages/qr-code-scanner/src/qr-code-scanner.js

@@ -165,10 +165,8 @@ export class QrCodeScanner extends ScopedElementsMixin(DBPLitElement) {
 
         const that = this;
         let constraint = null;
-        if ( this._('#videoSource').val === 'user' ) {
-            constraint = {facingMode:  {exact: ("user")}};
-        }
-        else if ( this._('#videoSource').val === 'environment' ) {
+
+        if ( this._('#videoSource').val === 'environment' || this._('#videoSource').val === 'user') {
             constraint = {facingMode:  {exact: ("environment")}};
         }
         navigator.mediaDevices.getUserMedia({ video:  { deviceId: this._('#videoSource').val, constraint}}).then(function(stream) {