Order by bitrate compares strings and not the integer value

[extremelf]

Describe the bug
When ordering by bitrate it shows in order compared as string type and by doing so for example we have (169 kbps, 201 kbps and 1000kbps) it will be shown in the order 1000 < 169 < 201 instead of 169 < 201 < 1000

To Reproduce
Steps to reproduce the behavior:

1. Go to 'songs'
2. Click on 'bitrate and order ascending'
3. See error

Expected behavior
The bitrates should be ordered by its integer value as stated in the description of the bug

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: Linux
• Version 0.12.0

[jeffvli]

Thanks for reporting this, accidentally set bitrate as a string.