Symbol doesn't work when there is a group inside of a group
# Bug report
## Expected behavior:
I created a group called "second button" with specific padding, works perfectly. Then I put it into another group and called it "button in table." That group has another background with another padding.

Both together work perfectly. It resizes all the shapes when I change the text. Here's the artboard

<img width="749" alt="captura de pantalla 2018-04-19 a la s 12 40 08" src="https://user-images.githubusercontent.com/895819/39002480-09063dfc-43cf-11e8-9bb9-4da0a723be5f.png">

## Actual behavior:
Then I converted this group into a symbol, but when I changed the text field of the symbol. The resize did not work. Here's the outcome.

![resize in symbol](https://user-images.githubusercontent.com/895819/39003383-2039ae44-43d1-11e8-83a5-e8f0a2e7419c.gif)

The sketch file has the artboard and all the elements

[Resize in symbol.sketch.zip](https://github.com/DWilliames/paddy-sketch-plugin/files/1928842/Resize.in.symbol.sketch.zip)


