[dw-free] "Read more" in latest shown unnecessarily triggered by entries with certain HTML

[fu]

[commit: http://hg.dwscoalition.org/dw-free/rev/fcf85d9cf6a0]

http://bugs.dwscoalition.org/show_bug.cgi?id=3001

Let the html_trim function tell us when we have truncated something, rather
than trying to guess.

Patch by fu.

Files modified:

• cgi-bin/LJ/Entry.pm
• cgi-bin/ljtextutil.pl
• htdocs/latest.bml

( Diff: 3 files changed. )