git-gui: Shorten Aspell version strings to just Aspell version number
git-gui: Shorten Aspell version strings to just Aspell version number

We really only support Aspell, so showing the compatibility line from
ispell is of little value to end users.

Signed-off-by: Shawn O. Pearce <f01032651c12a22b2103346ba96b3b6b231f9d3c@spearce.org>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git