[PATCH 4/6] test: fix emacs tests after tagging operations changes

[Austin Clements]

Quoth Dmitry Kurochkin on Jan 28 at  8:41 am:
> After the recent tagging operations changes, functions bound to "+"
> and "-" in notmuch-search and notmuch-show views always read input
> from the minibuffer.  Use kbd macros instead of calling them directly.

Should this be folded into the previous patch so these tests aren't
temporarily broken?