Fix: Weird neo-tree highlights;

[5-pebbles]

Fixes: #151

NeoTreeFileName was linked to NvimTreeNormal which has a bg specified that bg was overwriting the selection highlighting:

There are two ways this is can be fix:

1. G.NeoTreeFileName = { fg = C.fg }
2. Just remove the whole thing... It defaults to the normal foreground so I went with this. (Also that's what every other theme I looked at did).