Fixed Bug With drag region for the window

[JacobCutshall]

Pull Request

Description

I downloaded athas today to my Debian machine and noticed I couldn't really drag the window around. I looked at the Tauri documentation for data-tauri-drag-region and it says in a Note:

"data-tauri-drag-region" will only work on the element to which it is directly applied. 
If you want the drag behavior to apply to child elements as well, you’ll need to add it 
to each child individually.

This behavior is preserved so that interactive elements like buttons and inputs can function properly.

With that information I inspected the custom-title-bar and noticed the div with data-tauri-drag-region was mostly filled by the next child div labeled {/* Left side */}. Adding data-tauri-drag-region to this div fixed the issue by allowing the child that fills up moist of the space to also act as the drag region. The menu still works as expected.

• Added data-tauri-drag-region to the Left side div in custom-title-bar.tsx

Related Issues

Closes #450

[mehmetozguldev]

LGTM, thank you