openswap.conf - misspelled option

To reproduce - run a bare-metal installation using btrfs with swap, hibernate and encryption.

While troubleshooting the openswap.conf - found this https://github.com/calamares/calamares/issues/1659#issuecomment-920155121

I took the default openswap.conf and modified it - only to discover afterwards - a new test install - the config is almost correct when written by the installer only the keyfile_device_mount_options configuration is written as

keyfile_device_mount_options=keyfile_device_mount_options=--options=subvol=@

Which will create an error message as the expected line would be

keyfile_device_mount_options="--options=subvol=@"

Reference: https://forum.manjaro.org/t/calamares-writing-openswap-conf-with-btrfs/117031

@philm