Backspace key doesn't work in search

Submitted by Mohammed Sadiq @pksadiq

Link to original bug (#780765)

Description

The backspace key have no action in search.

How to reproduce:

1. Open Totem -> Videos tab (or Channels tab)
2. Press search button (Ctrl-F)
3. Type something in the search entry
4. Press backspace to remove the entered string.

Result: The typed characters are not removed. Though the delete button in the entry removes the whole text at once.

I'm using totem 3.22.1 from Debian GNU/Linux (testing).

Thanks

Version: 3.22.x