fixlastnameissue (reverted from commit 704aadbb3929a500af4769fcf76d0f1e3321c262)
Fixes #870 Not any last poster name in forumdisplay after splitting a/some post(s)
Fix #1023 feature

https://github.com/mybb/mybb/issues/1023
Merge pull request #1059 from Destroy666x/fix1023

Fix #1023 feature