Paddy stops working in automatic mode when I open another Sketch file
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### Bug report
#### Expected behavior:
When having two or more Sketch files opened Paddy auto-resize feature works fine as expected.


#### Actual behavior:
(Please include a screenshot or screen recording if possible)
When I open a file Paddy works perfect, but when I open another file, I mean having two Sketch files working at the same time, the auto resize feature stops working, I have to close Sketch then reopen it to have Paddy working again.


#### Steps to reproduce:
(Please attach a Sketch file if possible)
- Open Sketch File, or create a new one
- Create a group or whatever layer with a background as Paddy requests ([x x x x])
- Paddy auto-resize works fine
- Open or create another Sketch file with the previous one still opened
- Do something in the new file
- Paddy auto-resize feature stops working
- Close Sketch
- Reopen Sketch
- Paddy auto-resize works again.

