Update wireguard.sh 1, Added update WireGuard from source; 2, Check result when install or update WireGuard.
Update wireguard.sh
1, Added update WireGuard from source;
2, Check result when install or update WireGuard.

Signed-off-by: Teddysun <042dc4512fa3d391c5170cf3aa61e6a638f84342@teddysun.com>

teddysun/across,teddysun/across