wifi-scripts: declare the rsn_override option in the schema

Commit adb1fce19b ("wifi-scripts: set rsn_overriding for client mode
interfaces") made setup_sta() write rsn_overriding=1 for a station with
rsn_override set and an HE or EHT htmode. The wifi-iface schema did not
declare rsn_override, so netifd dropped the option before the handler
ran, and that branch could not be reached.

Declare it as a boolean without a default.

Fixes: adb1fce19b ("wifi-scripts: set rsn_overriding for client mode interfaces")
Signed-off-by: Felix Fietkau <nbd@nbd.name>

package/network/config/wifi-scripts/files-ucode/usr/share/schema/wireless.wifi-iface.json

@@ -1013,6 +1013,10 @@
 				"type": "string"
 			}
 		},
+		"rsn_override": {
+			"description": "Station mode with an HE or EHT htmode: use the RSNE Override elements of the AP (RSN overriding, wpa_supplicant rsn_overriding=1)",
+			"type": "boolean"
+		},
 		"rsn_preauth": {
 			"type": "boolean"
 		},