Update zxing-android-embedded with new custom activity

OpenKeychain/src/main/res/layout/qr_code_capture_activity.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical">
+
+    <com.journeyapps.barcodescanner.CompoundBarcodeView
+        android:id="@+id/zxing_barcode_scanner"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_alignParentBottom="true" />
+
+</RelativeLayout>