fix QR code icon size

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

app/src/main/res/drawable/qrcode_scan.xml

@@ -5,8 +5,8 @@
   ~ SPDX-License-Identifier: Apache-2.0
 -->
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
-    android:width="24dp"
-    android:height="24dp"
+    android:width="64dp"
+    android:height="64dp"
     android:tint="#FFFFFF"
     android:viewportWidth="960"
     android:viewportHeight="960">