etc/pam.d/Makefile.am: Fix typo

The commit we're fixing mentions that it wanted to move 'chpasswd', but
it removed 'ch_g_passwd' from 'pamd_acct_tools_files' and added
'chpasswd' to 'pamd_files'.  It seems it removed the wrong thing by
accident.

Fixes: 341d80c ("Makefile: move chpasswd and newusers to pamd target")
Link: <#928 (comment)>
Link: <#926 (comment)>
Reported-by: Dominique Leuenberger <[email protected]>
Reported-by: Michael Vetter <[email protected]>
Cc: loqs <https://github.com/loqs>
Cc: David Runge <[email protected]>
Cc: Iker Pedrosa <[email protected]>
Co-developed-by: Dominique Leuenberger <[email protected]>
Signed-off-by: Alejandro Colomar <[email protected]>

etc/pam.d/Makefile.am

@@ -12,7 +12,7 @@ pamd_files = \
 
 pamd_acct_tools_files = \
  chage \
- chpasswd \
+ chgpasswd \
  groupadd \
  groupdel \
  groupmod \