fix the bug for appStore version

fix the bug which caused by the CocoaScript syntax . this bug may find in the App Store version or 3.0.2 version .

link:[javascript-like-syntax-to-access-elements-in-msarrays-doesnt-work](https://github.com/sketchplugins/cocoascript-migration#javascript-like-syntax-to-access-elements-in-msarrays-doesnt-work)