I can zoom inside window

[solo-s]

**Platform: **

Darwin iMac-Sergej.local 16.6.0 Darwin Kernel Version 16.6.0: Fri Apr 14 16:21:16 PDT 2017; root:xnu-3789.60.24~6/RELEASE_X86_64 x86_64

**Sketchpacks for macOS Version: **

0.5.7

Steps to reproduce

1. Open Sketchpacks window
2. Zoom-in/out inside the window by gestures on trackpad or double tap on Magic Mouse.

Current behavior

Zoom is working, why this need here?

Expected behavior

I accidentally double tap on mouse, and broke the app 😱
I don't need zoom inside the app like this.

Workaround

Is this bug or feature? I don't know, but I think we don't need this)