[Other] HKG Extension CargoC Gates X1 to X6 max class increase to E

:bullseye: What is your suggestion?
Increase the maximum class of Gates X1 to X6 at HKG Extension CargoC from D to E.

:hammer_and_wrench: How would it work in the game?
Same way as other existing gates that can accommodate Class E cargo planes.

:balance_scale: Why is this a good idea?
Improved realism, to reflect real world operations.

:camera_with_flash: Optional: Image or reference
Example real life flights operated by Class E cargo planes that used these gates:

RH4568 (A332F) 29/4 Gate X1 (https://www.flightradar24.com/data/flights/rh4568#3f711c90)

LD128 (A332F) 29/4 Gate X6 ( B-LDS - Airbus A330-243F - DHL Air - Flightradar24 )

LD128 (A333P2F) 25/4 Gate X5 ( B-LDW - Airbus A330-343(P2F) - DHL Air - Flightradar24 )