Fix to use larger QR code [build]

webmin/twofactor-funcs-lib.pl

@@ -234,7 +234,7 @@ my $str = "otpauth://totp/".$name."?secret=".$user->{'twofactor_id'};
 my $url;
 if (&can_generate_qr()) {
 	$url = "$gconfig{'webprefix'}/webmin/qr.cgi?".
-	       "size=4&str=".&urlize($str);
+	       "size=6&str=".&urlize($str);
 	}
 else {
 	$url = "https://chart.googleapis.com/chart".

webmin/webmin-lib.pl

@@ -2873,7 +2873,7 @@ if (!$@) {
 	my $out;
 	Image::PNG::QRCode::qrpng(
 		text => $str,
-		scale => $size || 3,
+		scale => $size || 6,
 		out => \$out,
 		);
 	return ($out, "image/png");