fix: resplit input on alias

this makes it so itll properly check if the aliased *command* is
defined in lua
therefore, cd with an argument can be aliased now

shell.go

@@ -41,7 +41,7 @@ func RunInput(input string) {
 	if aliases[cmdArgs[0]] != "" {
 		alias := aliases[cmdArgs[0]]
 		cmdString = alias + strings.Trim(cmdString, cmdArgs[0])
-		cmdArgs[0] = alias
+		cmdArgs, cmdString = splitInput(cmdString)
 	}
 
 	// If command is defined in Lua then run it