Update showFileDialog in proguard-rules.pro

to match changes in 439ffd1

android-project/app/proguard-rules.pro

@@ -48,7 +48,7 @@
     boolean showTextInput(int, int, int, int, int);
     boolean supportsRelativeMouse();
     int openFileDescriptor(java.lang.String, java.lang.String);
-    boolean showFileDialog(java.lang.String[], boolean, boolean, int);
+    boolean showFileDialog(java.lang.String[], boolean, int, java.lang.String, int);
     java.lang.String getPreferredLocales();
     java.lang.String formatLocale(java.util.Locale);
 }