Bug#774181: audacity: Always appends the .aiff extension when exporting to WAV

[Stephen Paul Weber]

This bug still exists on stretch.  No matter what file type is selected for 
export, the extension ".aiff" is displayed (and used, if you forget to edit 
it).

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Stephen Paul Weber, @singpolyma
See <http://singpolyma.net> for how I prefer to be contacted
edition right joseph