urxvt tweaks

Change the "[NEW]" button to "+"^[1]

in /usr/lib/urxvt/perl/tabbed,

substr $text, 0, 7, "[NEW] |";
@$rend[0 .. 5] = ($self->{rs_tab}) x 6;
push @ofs, [0, 6, sub { $_[0]->new_tab }];

my $ofs = 7;
my $idx = 0;

becomes

substr $text, 0, 4,  " + |";
@$rend[0 .. 2] = ($self->{rs_tab}) x 3;
push @ofs, [0, 3, sub { $_[0]->new_tab }];

my $ofs = 4;
my $idx = 0;