Case 145210: Removed "Code" column from template for programs.

Knockout will not be affected by removed column.

If the "code" attribute of program instances is never used -- I haven't
checked -- we may want to remove the attribute from the model/document. I'm
leaving it for now.
Merge pull request #4746 from dimagi/145210-program-code-column

Removed "Code" column from CommTrack program list