Option to select how pull-up behave on non-focused terminal

- Focus Terminal: put focus back on the terminal window instead of hiding it.
- Hide Terminal: hide terminal window instead of putting the focus back to it.

Note:
The new behavior of pull-up was interrupting my usual workflow for two reasons.

1. When I have Tilda open in workspace A and I'm on workspace B, hitting pull-up key twice used to bring the Tilda to current workspace. But now it switch me to workspace A because of the Tilda window being focused.

2. I used to launch GUI application from the command like (i.e gvim, gitk, etc.) and if I feel I need space for the application (in a tiling WM) I hit the pull-up key to hide the Tilda window while in the newly launched application. New behavior takes the focus out of my working application which is not what I need.

I understand that other may prefer the new new behavior, therefor I made this patch so that user can choose which behavior they would like Tilda to have.