samples: nrf_compress: mcuboot_update: Fix renamed Kconfig

Fixes a Kconfig that was renamed

Signed-off-by: Jamie McCrae <[email protected]>

Author: nordicjm

samples/nrf_compress/mcuboot_update/prj.conf

@@ -51,7 +51,7 @@ CONFIG_BT_CTLR_DATA_LENGTH_MAX=251
 
 # Enable the Bluetooth mcumgr transport (unauthenticated).
 CONFIG_MCUMGR_TRANSPORT_BT=y
-CONFIG_MCUMGR_TRANSPORT_BT_AUTHEN=n
+CONFIG_MCUMGR_TRANSPORT_BT_PERM_RW=y
 CONFIG_MCUMGR_TRANSPORT_BT_CONN_PARAM_CONTROL=y
 
 # Enable the Shell mcumgr transport.