samples: bluetooth: peripheral_lbs: Fix the minimal configuration

This change increases the size of the sysworkq stack for
the minimal configuration.
This prevents stack overflow during CCC changes
when the device is bound.

Ref: NCSDK-15608

Signed-off-by: Marcin Jelinski <marcin.jelinski@nordicsemi.no>

Author: maje-emb

samples/bluetooth/peripheral_lbs/prj_minimal.conf

@@ -72,7 +72,7 @@ CONFIG_ARM_MPU=n
 CONFIG_BT_RX_STACK_SIZE=1024
 CONFIG_BT_HCI_TX_STACK_SIZE_WITH_PROMPT=y
 CONFIG_BT_HCI_TX_STACK_SIZE=640
-CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=512
+CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=1536
 CONFIG_MPSL_WORK_STACK_SIZE=640
 CONFIG_MAIN_STACK_SIZE=1024
 CONFIG_IDLE_STACK_SIZE=128