Bluetooth: Controller: Fix typo in BT_CTLR_ISOAL_SOURCES prompt
Bluetooth: Controller: Fix typo in BT_CTLR_ISOAL_SOURCES prompt

Fix typo in BT_CTLR_ISOAL_SOURCES Kconfig prompt message.

Signed-off-by: Vinayak Kariappa Chettimada <e780c9f87dc729ad454f47292ad82c8652353064@nordicsemi.no>

galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,finikorg/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr,finikorg/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr