[ticket/12130] Fix issue with li:first-child in <ul> having a bullet in IE8.

PHPBB3-12130
Merge pull request #2337 from prototech/ticket/12130

[ticket/12130] Fix issue with li:first-child in <ul> having a bullet in IE8.

* prototech/ticket/12130:
  [ticket/12130] Fix issue with li:first-child in <ul> having a bullet in IE8.