main/ttyescape: change licence to GPL-2.0 (MR 3042)

When moving the code to it's own repo I changed the license to GPL-2.0,
I forgot to update the APKBUILD.

[ci:skip-build] already built successfully in CI

main/ttyescape/APKBUILD

 # Maintainer: Caleb Connolly <caleb@connolly.tech>
 pkgname=ttyescape
 pkgver=1.0.1
-pkgrel=0
+pkgrel=1
 pkgdesc="Daemon to allow users to escape to a tty"
 url="https://gitlab.com/postmarketOS/ttyescape"
 arch="noarch"
-license="GPL-3.0-or-later"
+license="GPL-2.0"
 depends="hkdm buffyboard terminus-font kbd"
 install="$pkgname.post-install"
 subpackages="$pkgname-openrc"