gitweb: blame: Minimize vertical table row padding

gitweb: blame: Minimize vertical table row padding

Minimize vertical table row padding for blame only.  I
discovered this while having the browser's blame output
right next to my editor's window, only to notice how much
vertically stretched the blame output was.

Blame most likely shows source code and is in this way
more "spartan" than the rest of the tables gitweb shows.

This patch makes the blame table more vertically compact,
thus being closer to what you'd see in your editor's window,
as well as reusing more window estate to show more
information (which in turn minimizes scrolling).

Signed-off-by: Luben Tuikov <ltuikov@yahoo.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>