wifi: iwlwifi: mld: fix NAN DW end notification handler

wifi: iwlwifi: mld: fix NAN DW end notification handler

Use IWL_DEBUG_INFO instead of IWL_INFO for logging the DW end
notification, as this is a recurring event during NAN operation
and should not spam the kernel log.

Also fix a coding style issue - missing space after 'if'.

Signed-off-by: Daniel Gabay <daniel.gabay@intel.com>
Link: https://patch.msgid.link/20260512222731.0fd880fb80f9.Iacd459d0e2df28444bb6ccf8730e2f50440e6e32@changeid
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>