Code-insiders started from WSL doesn't return to console/ doesn't connect....

Code-insiders started from WSL doesn't return to console/ doesn't connect. Fixes microsoft/vscode-remote-release#780

resources/win32/bin/code.sh

@@ -16,7 +16,7 @@ if grep -qi Microsoft /proc/version; then
 		WSL_BUILD=18362
 	else
 		WSL_BUILD=$(uname -r | sed -E 's/^.+-([0-9]+)-Microsoft/\1/')
-		if ! [ -z "$WSL_BUILD" ]; then
+		if [ -z "$WSL_BUILD" ]; then
 			WSL_BUILD=0
 		fi
 	fi