samples: bluetooth: connection_event_trigger: Increase BT_RX_STACK_SIZE

The stack size needs to be increased after the upmerge, as the sample
reports stack overflow when printing logs.

Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no>

Author: rlubos

samples/bluetooth/connection_event_trigger/prj.conf

@@ -32,5 +32,6 @@ CONFIG_BT_SCAN_UUID_CNT=1
 CONFIG_BT_CTLR_SDC_EVENT_TRIGGER=y
 
 CONFIG_HEAP_MEM_POOL_SIZE=2048
+CONFIG_BT_RX_STACK_SIZE=1200
 
 CONFIG_BT_GAP_AUTO_UPDATE_CONN_PARAMS=n