Keyboard shortcuts are not working until the app is activated

[vstepaniuk]

Describe the bug
Keyboard shortcuts are not working until the app is activated

To Reproduce
Steps to reproduce the behavior:

1. Open WunderlistUX app
2. Click in the app
3. Press Ctrl+0 to start adding a new task - the cursor is placed in the input field
4. Press Ctrl+Tab twice to switch windows
5. Press Ctrl+0 - the cursor is NOT placed in the input field, until the app is activated

Expected behavior
Whenever the WunderlistUX window is active the Ctrl+0 shorcut should work

Desktop (please complete the following information):

• OS: Ubuntu 19.04 x64
• WunderlistUX Version: 0.0.8