RN: Rename Keyboard.remove{Event =>}Listener

Summary:
Renames `Keyboard.removeEventListener` to `Keyboard.removeListener`.

When I implemented the compatibility layer in {D26589441 (035718b)}, I accidentally used the wrong name. Since `Keyboard.removeEventListener` was always deprecated, this removes it completely.

Changelog:
[General][Changed] - Rename deprecated `Keyboard.removeEventListener` to `Keyboard.removeListener`.

Reviewed By: lunaleaps

Differential Revision: D32282743

fbshipit-source-id: 309382af3269f85f781d38367d115a2ce3690efb

Author: yungsters

Libraries/Components/Keyboard/Keyboard.js

@@ -142,9 +142,9 @@ class Keyboard {
   }
 
   /**
-   * @deprecated Use `remove` on the EventSubscription from `addEventListener`.
+   * @deprecated Use `remove` on the EventSubscription from `addListener`.
    */
-  removeEventListener<K: $Keys<KeyboardEventDefinitions>>(
+  removeListener<K: $Keys<KeyboardEventDefinitions>>(
     eventType: K,
     listener: (...$ElementType<KeyboardEventDefinitions, K>) => mixed,
   ): void {