wifi: iwlwifi: mld: reduce scope for uninitialized variable

After resuming from D3, keeping the connection or disconnecting
isn't relevant for the case of netdetect.
Reduce the scope of the keep_connection indicator to wowlan only.

Fixes: d1e879ec ("wifi: iwlwifi: add iwlmld sub-driver")
Signed-off-by: Yedidya Benshimol <yedidya.ben.shimol@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20250401064530.769f76a9ad6e.I69e8f194997eb3a20e40d27fdc31002d5753d905@changeid


Signed-off-by: Johannes Berg <johannes.berg@intel.com>