Fix typo (#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