meson: Fix oversight in install-quiet

meson: Fix oversight in install-quiet

In e522049f239 I accidentally forgot to add meson_bin to the argument list for
install-quiet. That kind of works on some platforms because the executable is
just 'python', wich the path to meson in an argument. But on windows meson
might be installed as an executable.

Reported-by: Andrew Dunstan <andrew@dunslane.net>
Discussion: https://postgr.es/m/b36dd6a4-748a-4737-54d5-dc8a50fdbe4b@dunslane.net