Disable test-idle-watcher

IdleWatcher was disabled in a98d23d9058cdf71a452e71bf8831e4ba2445b50

diff --git a/test/simple/test-idle-watcher.js b/test/disabled/test-idle-watcher.js
similarity index 100%
rename from test/simple/test-idle-watcher.js
rename to test/disabled/test-idle-watcher.js