Fix for player#setFlying not changing the player's flying status

[termanator1128]

Description

I have removed the check from setFlying to update the player's flying state. The current way prevents setting the player's flying state. IE: player.setFlying(true) would not make the player fly.

How has this been tested?

I just made a simple plugin when joining the server to set setAllowFlight and setFlying to true.

Checklist:

• [x] I have reviewed my code thoroughly.
• [x] I have tested my code.
• [x] My changes generate no new warnings

[MWHunter]

It is valid protocol for the server to set:

• Player can fly false
• Player is flying true

It locks the player into the state of flying. However, this isn't intuitive.