autoload/auditory.vim: Always map with <silent>

Turns out my assumption that we didn't need <silent> when `execute`ing
in 83449bf7e30d45f91eccbcdffd56abb126be56c1 was incorrect. When
performing <C-d>, the audio play command appears in the command line,
which is not the behaviour we want.

Let's just revert to always using `<silent>` and figure that should work
for us.

Figured out between the last commit and this one that my manual testing
wasn't with the latest code. I was using
a037e921a4b9b0539c93450fe3df1f6c8175ceab this whole time because I
didn't have my development setup configured correctly. Now I can
actually see what's going on as I make changes (what a concept!).

Also bring back the ternary since we're not setting any more variables
for this condition any more.

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