Fix a spell mistake
Fix a spell mistake

After commented default portable option in `app/meson.build` get some
error and then find this. :)

Signed-off-by: Romain Vimont <a1e17a20e93e5da710685444df3ad038ac66e2c9@rom1v.com>

Genymobile/scrcpy,Genymobile/scrcpy,Genymobile/scrcpy