[ticket/11343] Use === when checking stored user_actkey against user input.

Use strict comparison when checking whether stored user_actkey is equal to user
input.

PHPBB3-11343
[ticket/11343] Remove spare space.

PHPBB3-11343
[ticket/11343] Remove spare parentheses.

PHPBB3-11343
Merge PR #1219 branch 'bantu/ticket/11343' into develop-olympus

# By Andreas Fischer
# Via Andreas Fischer
* bantu/ticket/11343:
  [ticket/11343] Remove spare parentheses.
  [ticket/11343] Remove spare space.
  [ticket/11343] Use === when checking stored user_actkey against user input.