Increase checkbox spacing to have a 44px click handler

[juliushaertl]

From #10094:

Padding for checkbox settings (bottom left Files settings, Files sidebar link share options, Sharing settings): every entry needs at least 44px height for clickability, and more whitespace between checkbox and text
Sharing: More padding for checkbox entries, 44px as usual

We should add a padding to all checkboxes with their labels in the global input css, but I would suggest to do this for 15, since i would expect this might cause quite some bugs all over the places where the checkboxes are used.

[MorrisJobke]

@nextcloud/designers Should we still do this? Then we would need to do it until Wednesday (it should be merged by then).

[MorrisJobke]

This seems similar to #7481

[MorrisJobke]

Moved to 16.

[skjnldsv]

I guess we could start with nextcloud-libraries/nextcloud-vue#649 ?

[juliushaertl]

We're back to smaller click targets but most of it is handled by the library today. Closing.