[notmuch] emacs: Fix for '=' in search view (to not return to top of buffer)

[Carl Worth]

We've had a regression in the emacs interface for a long time. The '='
key, (for refreshing the current search results), would obnoxiously
reset the cursor to the first line of the buffer.

This finally drove me sufficiently crazy that I just fixed this.

Enjoy,

-Carl
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