gitweb: Fix escaping HTML of project owner in 'projects_list' and 'summary' views

gitweb: Fix escaping HTML of project owner in 'projects_list' and 'summary' views

This for example allows to put email address in the project owner
field in the projects index file (when $projects_list points to
a file, and not to a directory), in the form of:

path/to/repo.git Random+J+Developer+<redacted>

Noticed-by: Jon Smirl <redacted>
Signed-off-by: Jakub Narebski <redacted>
Signed-off-by: Petr Baudis <redacted>
Signed-off-by: Junio C Hamano <redacted>