Change vertical split color to gutter grey

[mortezadadgar]

trafficstars

I think this makes more sense than default black color.

Signed-off-by: mortezadadgar [email protected]

[mortezadadgar]

Maybe it's a better idea to completely get rid of vertsplit variable

[joshdick]

The equivalent of this change was included in #271. Let me know if that resolves this issue.

[mortezadadgar]

I can't believe this pr was open for this long, thanks for your attention