[Toybox] patch: make login use the shared read_passwd function

[Elie De Brauwer]

All,

In attach a patch which make the entire things actually smaller ;), 
login.c used a function to read a password which was virtually identical 
to a more globally defined function in lib/password.c, so I removed the 
one in login.c and made use of the function defined elsewhere.

Some comments not in this patch here, but these a trivial whitespace fixes.
- lib/password.c needs a spaces to tab fix.
- lib/password.c has a wrong filename in the header comment.
- lib/passwd.c also needs a spaces to tab fix.

gr
E.
-- 
Elie De Brauwer

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