Bug Report - Padding and horizontal spacing not preserved when nested within a symbol
### Bug report
#### Expected behavior:
I am constructing a radio button group consisting of 2 options. Within each option I have a label and a background which has padding applied and a minimum width of 80px [10 16; width >= 80]. 

The options are grouped and the folder has a vertical space of -1 is applied [-1h] in order to remove the double border.

When I increase the length of the labels I expect the width of the button to increase to maintain the set padding. This would also push the adjacent button in order to preserve the desired layout.



#### Actual behavior:
This works as expected when you have a single instance but does not work when converted to a symbol.

The text expands outside of the set background and the adjacent button doesn't move as expected.

![giphy](https://user-images.githubusercontent.com/37873454/38036999-dc34040c-329f-11e8-9757-56b43ca3e506.gif)

This was created in Sketch 49 and using Paddy v1.0.7