Remove Content-Type header from index.live.cgi

cPanel's live engine provides the HTTP headers and page chrome
(sidebar, topbar). CGI should not output its own Content-Type.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cpanel/gniza/index.live.cgi

@@ -19,7 +19,6 @@ use Cpanel::AdminBin::Call ();
 use GnizaCPanel::UI;
 
 my $cpanel = Cpanel::LiveAPI->new();
-print "Content-Type: text/html\r\n\r\n";
 
 # Get allowed remotes via AdminBin
 my $remotes_raw = eval { Cpanel::AdminBin::Call::call('Gniza', 'Restore', 'LIST_ALLOWED_REMOTES') } // '';