[nrf fromtree] Bluetooth: Mesh: Fix cfg_cli KRP not working for key_net_idx != 0

Initializes the `net_idx` field of the ack context properly for KRP
functions in the Config Client.

This fixes a problem where `bt_mesh_cfg_cli_krp_get` and
`bt_mesh_cfg_cli_krp_set` would always fail the ack ctx comparison if
`key_net_idx` was != 0.

Signed-off-by: Ludvig Jordet <[email protected]>
(cherry picked from commit 88f62a1)
Signed-off-by: Håvard Reierstad <[email protected]>
(cherry picked from commit 48cdbac)

Author: ludvigsj

subsys/bluetooth/mesh/cfg_cli.c

@@ -1187,6 +1187,7 @@ int bt_mesh_cfg_cli_krp_get(uint16_t net_idx, uint16_t addr, uint16_t key_net_id
 	struct krp_param param = {
 		.status = status,
 		.phase = phase,
+		.net_idx = key_net_idx,
 	};
 	const struct bt_mesh_msg_rsp_ctx rsp = {
 		.ack = &cli->ack_ctx,
@@ -1209,6 +1210,7 @@ int bt_mesh_cfg_cli_krp_set(uint16_t net_idx, uint16_t addr, uint16_t key_net_id
 	struct krp_param param = {
 		.status = status,
 		.phase = phase,
+		.net_idx = key_net_idx,
 	};
 	const struct bt_mesh_msg_rsp_ctx rsp = {
 		.ack = &cli->ack_ctx,