chore(hosts): drop redundant return {} from host lua files

require() only needs the module's side effects; the returned value is
ignored by hyprland.lua. Chester.lua and example.lua now match
Rutherford.lua in ending after their config statements.

hypr/hosts/Chester.lua

@@ -9,5 +9,3 @@ hl.monitor({
     position = "0x0",
     scale    = 1.5,
 })
-
-return {}