Don't assume existence of a LOG file in abstract destroy-test

abstract/destroy-test.js

@@ -8,10 +8,10 @@ module.exports = function (test, level) {
   test('test destroy', function (t) {
     t.plan(4)
     t.ok(fs.statSync(location).isDirectory(), 'sanity check, directory exists')
-    t.ok(fs.existsSync(path.join(location, 'LOG')), 'sanity check, log exists')
+    t.ok(fs.existsSync(path.join(location, 'CURRENT')), 'sanity check, CURRENT exists')
     level.destroy(location, function (err) {
       t.notOk(err, 'no error')
-      t.notOk(fs.existsSync(path.join(location, 'LOG')), 'db gone (mostly)')
+      t.notOk(fs.existsSync(path.join(location, 'CURRENT')), 'db gone (mostly)')
     })
   })
 }