[FIX] point_of_sale: print not working in Mobile App

Before this commit, "document.execCommand" was first
method used when attempting to print, due to a bug
in Safari for Windows (ndr. which is deprecated as
the last version of Safari for Windows is 5.1.7
from may 2012).

On the mobile App, the "document.execCommand('print')"
call returns "true" even if nothing has actually been
done, which therefore prevents from executing "window.print()".

After this commit, we execute directly "window.print()"
as it's supported by all modern browsers (except Firefox Android,
which doesn't support printing at all).

Notes:
* "document.execCommand" is deprecated and the "print" command isn't even documented
* Safari 5.1.7 doesn't support Promise/Async/Await, and therefore not Odoo 13+.

References:
* https://developer.mozilla.org/en-US/docs/Web/API/Document/execCommand
* https://developer.mozilla.org/en-US/docs/Web/API/Window/print
* https://caniuse.com/?search=await
* https://caniuse.com/?search=promise
* https://apple.stackexchange.com/questions/68836/where-can-i-download-safari-for-windows

opw-2486818

closes odoo/odoo#70155

Signed-off-by: Pierre Paridans <pparidans@users.noreply.github.com>

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