busybox: unindent busybox Config.in

busybox: unindent busybox Config.in

This is to align with upstream change 72089cf ("config: deindent all
help texts") and to make the follow-up change syncing Config.in files
with current busybox version more reviewable

It was made with the following commands

	cd package/utils/busybox/config
	find . -name 'Config.in' | xargs sed -ir -e 's/^\t  \([^ ]\)/\t\1/'

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>