gitweb: Whitespace cleanup - tabs are for indent, spaces are for align (3)

Code should be look the same way, regardless of tab size.
Use tabs for indent, but spaces for align.

Indent continued part of command spanning multiple lines, but only once.

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>