[ticket/11295] Correct cases: replace postgres with phpbb_db_driver_postgres.

PHPBB3-11295
Merge PR #1207 branch 'bantu/ticket/11295' into develop

# By Andreas Fischer
# Via Andreas Fischer
* bantu/ticket/11295:
  [ticket/11295] Correct cases: replace postgres with phpbb_db_driver_postgres.
Merge PR #1219 branch 'develop-olympus' into develop

# By Andreas Fischer
# Via Andreas Fischer (1) and Oleg Pudeyev (1)
* develop-olympus:
  [ticket/11343] Remove spare parentheses.
  [ticket/11343] Remove spare space.
  [ticket/11343] Use === when checking stored user_actkey against user input.
[ticket/11303] add S_TZ_PRESELECT template var

add a new template variable to check if timezone has already been selected
by the user while registeration.

PHPBB3-11303