refactor: setup autocd opt in a better way

with the previous commit allowing users to override
hilbish.runner.sh and it being ran by hilbish, the
code for the autocd opt can just override that
function and do the autocd functionality instead
of reimplementing a hybrid runner.

this means that if any other custom runner wants
autocd functionality they can have it with the sh runner

nature/opts/autocd.lua

@@ -1,13 +1,8 @@
 local fs = require 'fs'
 
-function cdHandle(inp)
+local oldShRunner = hilbish.runner.sh
-	local res = hilbish.runner.lua(inp)
+function hilbish.runner.sh(input)
-
+	local res = oldShRunner(input)
-	if not res.err then
-		return res
-	end
-
-	res = hilbish.runner.sh(inp)
 
 	if res.exit ~= 0 and hilbish.opts.autocd then
 		local ok, stat = pcall(fs.stat, res.input)
@@ -21,5 +16,3 @@ function cdHandle(inp)
 
 	return res
 end
-
-hilbish.runner.setMode(cdHandle)