Fix typo (appium#1250)

Author: ki4070ma

src/main/java/io/appium/java_client/android/nativekey/AndroidKey.java

@@ -1021,7 +1021,7 @@ public enum AndroidKey {
  * Key code constant: Media Top Menu key.
  * Goes to the top of media menu.
  */
- _MEDIA_TOP_MENU(226),
+ MEDIA_TOP_MENU(226),
  /**
  * Key code constant: '11' key.
  */
@@ -1178,7 +1178,7 @@ public enum AndroidKey {
  * Goes to the context menu of media contents. Corresponds to Media Context-sensitive
  * Menu (0x11) of CEC User Control Code.
  */
- _TV_MEDIA_CONTEXT_MENU(257),
+ TV_MEDIA_CONTEXT_MENU(257),
  /**
  * Key code constant: Timer programming key.
  * Goes to the timer recording menu. Corresponds to Timer Programming (0x54) of