(re-)enable application rollback for bootloader

Author: jpcornil-git

sdkconfig.defaults

@@ -4,6 +4,8 @@ CONFIG_ESPTOOLPY_FLASHSIZE_8MB=y
 CONFIG_ESP_CONSOLE_USB_SERIAL_JTAG=y
 # Custom partition table
 CONFIG_PARTITION_TABLE_CUSTOM=y
+# Enable rollback
+CONFIG_BOOTLOADER_APP_ROLLBACK_ENABLE=y
 # Logs
 CONFIG_BOOT_ROM_LOG_ALWAYS_OFF=y
 CONFIG_LOG_COLORS=y