[FIX] mail: prevents crash when trying to close the audioContext

Before this commit, since https://github.com/odoo/odoo/pull/119014,
the audio context could be closed when already.

Until the implementation of AudioContext.state*, we have to catch the
error.

This commit also removes the forwarding to the destination that was
not necessary.

`* https://webaudio.github.io/web-audio-api/#widl-AudioContext-state



closes odoo/odoo#119392

Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>