The column layout is unfriendly when the property name is too long

[v-ruizh]

Storage Explorer Version: 1.9.0
Branch: master
Build: 20190806.12
Platform/OS: Linux Ubuntu/macOS High Sierra/Windows 10
Architecture: ia32/x64
Regression From: Not a regression

Steps to reproduce:

1. Launch storage explorer -> Navigate to one table.
2. Add an entity which has one property name with 255 characters.
3. Open 'Column Options' dialog.
4. Check the layout for this dialog.

Expect Experience:
The layout is friendly.

Actual Experience:
The layout is unfriendly.