Bug in `fly: deny` flag granting flight when TP'ing out of region and changing gamemode to survival

[ens-gijs]

https://github.com/aromaa/WorldGuardExtraFlags/blob/3f6f58c811027d33b572ec0406146fa67b27eac7/Spigot/src/main/java/net/goldtreeservers/worldguardextraflags/listeners/PlayerListener.java#L155

Setup:

• spawn wg region with fly: deny
• command block under /spawn location that sets player gamemode to survival
• player is in spectator outside spawn wg region
• player runs /spawn
• player runs custom rtp command that sets player gamemode to survival (even if they are already in survival) and TP's them away (using paper async tp)
• player can now double jump to fly while in survival