fix(kconfig): use 'n' instead of '0'/'false' for bool defaults

Bool symbols in nimble, BTDM, and two examples used invalid default
literals. The parser already falls back to 'n'; set that explicitly.

Co-authored-by: Cursor <cursoragent@cursor.com>

components/bt/controller/esp32/Kconfig.in

@@ -177,7 +177,7 @@ config BTDM_CTRL_LEGACY_AUTH_VENDOR_EVT
 config BTDM_CTRL_LEGACY_AUTH_VENDOR_EVT_EFF
     bool
     default BTDM_CTRL_LEGACY_AUTH_VENDOR_EVT if BTDM_CTRL_MODE_BR_EDR_ONLY || BTDM_CTRL_MODE_BTDM
-    default 0
+    default n
 
 
 config BTDM_CTRL_BLE_MAX_CONN_EFF

components/bt/host/nimble/Kconfig.in

@@ -1452,7 +1452,7 @@ menu "NimBLE Mesh"
 
     config BT_NIMBLE_MESH_PROVISIONER
         bool "Enable BLE mesh provisioner"
-        default 0
+        default n
         depends on BT_NIMBLE_MESH
         help
             Enable mesh provisioner.

examples/peripherals/twai/twai_utils/main/Kconfig.projbuild

@@ -6,7 +6,7 @@ menu "TWAI Configuration"
     config EXAMPLE_ENABLE_TWAI_FD
         bool "Enable TWAI-FD Support"
         depends on SOC_TWAI_FD_SUPPORTED
-        default false
+        default n
         help
             Enable TWAI-FD (Flexible Data-rate) support.
             Allows up to 64 bytes of data per frame and dual bit rates.

examples/wifi/scan/main/Kconfig.projbuild

@@ -9,7 +9,7 @@ menu "Example Configuration"
 
     config EXAMPLE_USE_SCAN_CHANNEL_BITMAP
         bool "Scan only non overlapping channels using Channel bitmap"
-        default 0
+        default n
         help
             Enable this to scan only the non overlapping channels i.e 1,6,11 by mentioning a channel bitmap
             in scan config. If you wish to scan a different set of specific channels, please edit the channel_list