Fix parsing window ID on Linux (#173)

Author: jyboudreau

lib/linux.js

@@ -90,7 +90,7 @@ async function getWindowInformation(windowId) {
 	]);
 
 	const data = parseLinux({
-		windowId,
+		activeWindowId: windowId,
 		boundsStdout,
 		stdout
 	});
@@ -108,7 +108,7 @@ function getWindowInformationSync(windowId) {
 	const boundsStdout = childProcess.execFileSync(xwininfoBin, [...xpropDetailsArgs, windowId], {encoding: 'utf8'});
 
 	const data = parseLinux({
-		windowId,
+		activeWindowId: windowId,
 		boundsStdout,
 		stdout
 	});