fix direction of VerticalSwipeJump gestures

Summary:
When something comes in from the right, we swipe from left to
right to move back. That means, when something comes in from the bottom,
we should swipe from top to bottom to get rid of it. This diff makes that
behavior occur - right now it's somewhat nonsensical as both jumpBack
and jumpForward are mapped to the same gesture.

thanks to #11192 for making gestures work on VerticalUpSwipeJumps

Reviewed By: ericvicenti, shergin

Differential Revision: D4412129

fbshipit-source-id: 6a3b202b0a90ca459b4ef106ba5bf48d0b1aec9e

Libraries/CustomComponents/Navigator/NavigatorSceneConfigs.js

@@ -32,8 +32,8 @@
 'use strict';
 
 var Dimensions = require('Dimensions');
-var PixelRatio = require('PixelRatio');
 var I18nManager = require('I18nManager');
+var PixelRatio = require('PixelRatio');
 
 var buildStyleInterpolator = require('buildStyleInterpolator');
 
@@ -745,7 +745,7 @@ var NavigatorSceneConfigs = {
     ...BaseConfig,
     gestures: {
       jumpBack: {
-        ...BaseDownUpGesture,
+        ...BaseUpDownGesture,
         overswipe: BaseOverswipeConfig,
         edgeHitWidth: null,
         isDetachable: true,
@@ -766,7 +766,7 @@ var NavigatorSceneConfigs = {
     ...BaseConfig,
     gestures: {
       jumpBack: {
-        ...BaseUpDownGesture,
+        ...BaseDownUpGesture,
         overswipe: BaseOverswipeConfig,
         edgeHitWidth: null,
         isDetachable: true,