fix 'a' problem with the gjs example

[NullVoxPopuli]

the modifier import was shadowing the keyword.

The new error is

Uncaught (in promise) TypeError: scheduledUpdateModifiers[Symbol.iterator]().next().value is undefined
    commit runtime.js:3904
    commit runtime.js:3972
    inTransaction runtime.js:3991
    Ember 3
    invoke backburner.js.js:272
    flush backburner.js.js:188
    flush backburner.js.js:344
    _end backburner.js.js:773
    _boundAutorunEnd backburner.js.js:509
    promise callback*buildNext/< backburner.js.js:26
    flush Ember