gitweb: Move 'lineno' id from link to row element in git_blame

gitweb: Move 'lineno' id from link to row element in git_blame

Move l<line number> ID from <a> link element inside table row (inside
cell element for column with line numbers), to encompassing <tr> table
row element.  It was done to make it easier to manipulate result HTML
with DOM, and to be able write 'blame_incremental' view with the same,
or nearly the same result.

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Acked-by: Luben Tuikov <ltuikov@yahoo.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>