functions/default.sh : Define LB_PRIMARY_BOOTLOADER at the Set_defaults function which it's the right place where to do it

functions/defaults.sh

@@ -537,6 +537,8 @@ Set_defaults ()
 		esac
 	fi
 
+	LB_PRIMARY_BOOTLOADER=$(echo "${LB_BOOTLOADERS}" | awk -F, '{ print $1 }')
+
 	# Setting checksums
 	case "${LB_MODE}" in
 		progress-linux)
@@ -845,9 +847,6 @@ Check_defaults ()
 		fi
 	fi
 
-
-	LB_PRIMARY_BOOTLOADER=$(echo "${LB_BOOTLOADERS}" | awk -F, '{ print $1 }')
-
 	if [ "${LB_PRIMARY_BOOTLOADER}" = "syslinux" ]
 	then
 		# syslinux + fat or ntfs, or extlinux + ext[234] or btrfs