Remove ref from SnapshotViewIOS (#506)

Author: sgny

reason-react-native/src/components/SnapshotViewIOS.bs.js

@@ -1,6 +1 @@
-'use strict';
-
-var NativeElement$ReactNative = require("../elements/NativeElement.bs.js");
-
-
-/* NativeElement-ReactNative Not a pure module */
+/* This output is empty. Its source's type definitions, externals and/or unused code got optimized away. */

reason-react-native/src/components/SnapshotViewIOS.md

@@ -5,12 +5,9 @@ wip: true
 ---
 
 ```reason
-include NativeElement;
-
 [@react.component] [@bs.module "react-native"]
 external make:
   (
-    ~ref: ref=?,
     // SnapshotViewIOS props
     ~onSnapshotReady: Event.syntheticEvent({. "testIdentifier": string}) =>
                       unit

reason-react-native/src/components/SnapshotViewIOS.re

@@ -1,10 +1,7 @@
-include NativeElement;
-
 [@react.component] [@bs.module "react-native"]
+// SnapshotViewIOS props
 external make:
   (
-    ~ref: ref=?,
-    // SnapshotViewIOS props
     ~onSnapshotReady: Event.syntheticEvent({. "testIdentifier": string}) =>
                       unit
                         =?,