Remove pointer warp from test boilerplate

Long description:

Remove the line to warp the pointer to (0, 0) in `new-test` helper
script, which is used to create new tests.

Since 4.6-g0634766, testcases may assume at the start of the test that
the pointer begins at position (0, 0).

To apply this patch, use:
curl http://cr.i3wm.org/patch/344/raw.patch | git am

@@ -83,10 +83,6 @@ if ($multi_monitor) {

     print $fh <<'EOF';

 use i3test i3_autostart => 0;

-# Ensure the pointer is at (0, 0) so that we really start on the first

-# (the left) workspace.

-$x->root->warp_pointer(0, 0);

-

 my $config = <<EOT;

 # i3 config file (v4)

 font -misc-fixed-medium-r-normal--13-120-75-75-C-70-iso10646-1