Revert QR code video size fix

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

@@ -422,10 +422,8 @@ export class QrCodeScanner extends ScopedElementsMixin(DBPLitElement) {
             }
         
             #canvas {
-                width: auto;
-                max-width: 100%;
+                width: 100%;
                 margin-top: 2rem;
-                height: 90vh;
                 max-height: 100%;
             }