[ticket/12887] Fix Typo: offest -> offset

PHPBB3-12887
Merge pull request #2773 from bantu/ticket/12887

[ticket/12887] Fix Typo: offest -> offset
Merge branch 'develop-ascraeus' into develop

# By Andreas Fischer
# Via Andreas Fischer (1) and Dhruv Goel (1)
* develop-ascraeus:
  [ticket/12887] Fix Typo: offest -> offset