Fix webview layout constraint

Author: hichamboushaba

WooCommerce/src/main/res/layout/fragment_receipt_preview.xml

@@ -37,7 +37,7 @@
     <WebView
         android:id="@+id/receipt_preview_preview_webview"
         android:layout_width="match_parent"
-        android:layout_height="match_parent"
+        android:layout_height="0dp"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"