Move flex gap props to correct type

Summary:
Missed while reviewing #34974 that flex gap props in Flow typings were added to ShadowStyle instead of LayoutStyle (directly above). The same issue is not present in the TS typings.

Changelog:
[General][Fixed] - Move flex gap props to the correct type

Reviewed By: yungsters

Differential Revision: D41736652

fbshipit-source-id: de0db1676464fbd962b2c7e7e9ef62b795332f1b

Author: NickGerleman

Libraries/StyleSheet/StyleSheetTypes.js

@@ -554,6 +554,19 @@ type ____LayoutStyle_Internal = $ReadOnly<{
    *  @platform ios
    */
   direction?: 'inherit' | 'ltr' | 'rtl',
+
+  /**
+   * In React Native, gap works the same way it does in CSS.
+   * If there are two or more children in a container, they will be separated from each other
+   * by the value of the gap - but the children will not be separated from the edges of their parent container.
+   * For horizontal gaps, use columnGap, for vertical gaps, use rowGap, and to apply both at the same time, it's gap.
+   * When align-content or justify-content are set to space-between or space-around, the separation
+   * between children may be larger than the gap value.
+   * See https://developer.mozilla.org/en-US/docs/Web/CSS/gap for more details.
+   */
+  rowGap?: number,
+  columnGap?: number,
+  gap?: number,
 }>;
 
 /**
@@ -590,19 +603,6 @@ export type ____ShadowStyle_InternalCore = $ReadOnly<{
    * @platform ios
    */
   shadowRadius?: number,
-
-  /**
-   * In React Native, gap works the same way it does in CSS.
-   * If there are two or more children in a container, they will be separated from each other
-   * by the value of the gap - but the children will not be separated from the edges of their parent container.
-   * For horizontal gaps, use columnGap, for vertical gaps, use rowGap, and to apply both at the same time, it's gap.
-   * When align-content or justify-content are set to space-between or space-around, the separation
-   * between children may be larger than the gap value.
-   * See https://developer.mozilla.org/en-US/docs/Web/CSS/gap for more details.
-   */
-  rowGap?: number,
-  columnGap?: number,
-  gap?: number,
 }>;
 
 export type ____ShadowStyle_Internal = $ReadOnly<{