Check for FlagUp when selecting iface

Fix iface selection on windows

.gitignore

@@ -15,4 +15,5 @@ stage/
 /snap
 .idea
 
-bettercap.exe
+*.exe
+.vscode/

network/net.go

@@ -261,7 +261,7 @@ func FindInterface(name string) (*Endpoint, error) {
 			fmt.Printf("wtf of the day: %s", err)
 			continue
 		}
-
+		if iface.Flags&net.FlagUp != 0 {
 			for _, address := range addrs {
 				ip := address.String()
 				if !strings.HasPrefix(ip, "127.0.0.1") && IPv4BlockValidator.MatchString(ip) {
@@ -269,6 +269,7 @@ func FindInterface(name string) (*Endpoint, error) {
 				}
 			}
 		}
+	}
 
 	return nil, ErrNoIfaces
 }