test: use common.pkg basedir in newly added test

Missed this on the review.  Minor nit, not worth rebasing, now that the
release is almost ready to ship.

test/tap/outdated-remote.js

@@ -6,7 +6,7 @@ const File = Tacks.File
 const Dir = Tacks.Dir
 const common = require('../common-tap.js')
 
-const basedir = path.join(__dirname, path.basename(__filename, '.js'))
+const basedir = common.pkg
 const testdir = path.join(basedir, 'testdir')
 const cachedir = path.join(basedir, 'cache')
 const globaldir = path.join(basedir, 'global')