Styling of Storage tab in Preferences broken

[Flexo013]

Current behavior

Storage tab in preferences isn't displayed properly after updating to 0.12.0 (from 0.11.15).

Expected behavior

The styling should work.

Steps to reproduce

1. Open the preferences.
2. (Select the storage tab if needed.)

Environment

• Version : 0.12.0
• OS Version and name : Windows 10

[themattgabriel]

Environment

• Boostnote Version: 0.12.0
• OS: Windows 10
• Version: 1903

[Rokt33r]

Fixed by #3165