print/xreader: drop unused Meson options after b8fb83c300a8

meson.build:1:0: ERROR: Unknown options: "tests"

https://github.com/linuxmint/xreader/commit/d39327d5a7c3

PR: 259080
Reported by: antoine (via exp-run)
Regressed by: https://github.com/mesonbuild/meson/commit/dbf2ace6ca1c