Revert "tkinter is disabled for macOS PyPy"

This reverts commit 0b624c6.

Author: radarhere

config.sh

@@ -144,11 +144,7 @@ function run_tests_in_repo {
 }
 
 EXP_CODECS="jpg jpg_2000 libtiff zlib"
-if [[ "$MB_PYTHON_VERSION" == pypy3.* ]] && [ -n "$IS_MACOS" ]; then
-    EXP_MODULES="freetype2 littlecms2 pil webp"
-else
-    EXP_MODULES="freetype2 littlecms2 pil tkinter webp"
-fi
+EXP_MODULES="freetype2 littlecms2 pil tkinter webp"
 EXP_FEATURES="fribidi harfbuzz libjpeg_turbo raqm transp_webp webp_anim webp_mux xcb"
 
 function run_tests {