Set correct WireGuard interface MTU on boot/config changes. Fixes #11482
(cherry picked from commit 5b141e80eca7718043a83bb690dfe2d8db04ee87)
Set correct WireGuard interface MTU on boot/config changes. Fixes #11482
(cherry picked from commit 5b141e80eca7718043a83bb690dfe2d8db04ee87)