a minor fix of Vx.pm

[hubertyang88]

------------------ Openkore Issues Template ------------------

in Vx.pm

use I18N qw(bytesToString);

sub packet {
...
	} elsif ($switch eq "09DE") {
		# Private message
		my ($privMsgU) = substr($msg, 8, 25) =~ /([\s\S]*?)\000/;
		my $privMsgUser = bytesToString($privMsgU);
		$self->pm_add($privMsgUser);
...
}

it will fix Private Chat use 09DE for Vx
in case anyone need this.

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