style(interactive): remove duplicated shebang line

lib/functions/configuration/interactive.sh has a stray second
'#!/usr/bin/env bash' on line 10, right after the SPDX/copyright
header, introduced by commit b7b8eb7 ("Add / modify (c) in bash
scripts", #4922) where the (c) header was inserted above the
existing shebang and the original below was left in place.

bash treats it as a comment so behaviour is unchanged, but it is
cosmetic noise. Single-line removal, no other edits.

Assisted-by: Claude:claude-opus-4.7

Author: iav

lib/functions/configuration/interactive.sh

@@ -7,8 +7,6 @@
 # This file is a part of the Armbian Build Framework
 # https://github.com/armbian/build/
 
-#!/usr/bin/env bash
-
 function interactive_config_prepare_terminal() {
 	if [[ -z $ROOT_FS_CREATE_ONLY ]]; then
 		if [[ -t 0 ]]; then # "-t fd return True if file descriptor fd is open and refers to a terminal". 0 = stdin, 1 = stdout, 2 = stderr, 3+ custom