(finder-mode): Don't switch buffers or change text here.

(finder-mode): Don't switch buffers or change text here.
(finder-by-keyword): Don't call finder-mode here.
(finder-list-matches): Call finder-mode here.
Switch to a buffer called *Finder Category*.
(finder-list-keywords): Call finder-mode here.
Switch to the buffer *Finder*.
If the buffer already exists, don't reinitialize it or move point.