Revert "Made wp_upload_dir available to dompdf"

This reverts commit 4c40cd296257aae3b0c339f5c7661e0bd3ea8968.
Revert "Changed $wp_uploads_path[basedir] to ['basedir']"

This reverts commit 157e3a313574684c5c43df04280d39ad541d1163.
Revert "Default values now populates the fields if required"

This reverts commit 4505002cf55f851cf0bc57e1aa09627605b4a5dd.