Fixed the bug that 'back-to-indentation' operation breaks "." repeating

[York Zhao]

>> To me, 'back-to-indentation' is handy because I feel it is easier than pressing
>> "0" plus "w".
>
> And pressing "^" is even easier ;)

Thanks for reminding, I almost fogot this because of not using it for a long
time. However I don't think "^" is easier than "M-m" because both "ALT" and "m"
are next to home row, I press ALT using my thumb so it's much easier than
pressing SHIFT and of course "m" is much easier than "6". Give "M-m" a go and
you might like it.

York