Fixes #2051

Previously, --chdir and --recursive could not be used together.

$ tflint --chdir=infra --recursive
Failed to find workspaces; cannot use --recursive and --chdir at the same time

This is because the --recursive was originally designed as --chdir for multi-directory #1612 #1622
Given this background, using them together was out of scope. Also, it is not obvious whether --recursive or --chdir takes precedence, which can lead to strange behavior when --recursive takes precedence.

However, given that terraform -chdir=infra fmt --recursive is a valid command, it is natural to expect similar behavior. In terraform fmt, -chdir takes precedence and recurses into the directory after the move. TFLint follows this behavior.