Add quite space before and after barcode

This is to help barcode scanners determine where the end of
the barcode is.

app/src/main/res/layout/loyalty_card_view_layout.xml

@@ -33,6 +33,8 @@
                 android:layout_height="0dp"
                 android:layout_marginTop="20.0dip"
                 android:layout_marginBottom="10.0dip"
+                android:layout_marginStart="15.0dip"
+                android:layout_marginEnd="15.0dip"
                 app:layout_constraintBottom_toTopOf="@+id/centerGuideline"
                 app:layout_constraintEnd_toEndOf="parent"
                 app:layout_constraintStart_toStartOf="parent"