Load filter conditions when the user presses ENTER

Cleanup:
- Trim the field value before trying to load the filter
- Add the pattern to the box using .val() instead of .text(), to
  update the content even if the user has made changes to it

Bug: 51402
Change-Id: I4ae671941571dce206448424f8e996cb99ac8d41
Merge "Load filter conditions when the user presses ENTER"