Fixes double compilation in readme test environments

Author: GOB52

platformio.ini

@@ -292,8 +292,6 @@ extends=NessoN1, option_release, test_base, pioarduino_latest
 ; Works in CI without lib/ symlinks
 ; --------------------------------
 [readme_base]
-test_build_src = false
-lib_extra_dirs = .
 lib_deps = m5stack/M5Unified
   m5stack/M5Utility
   m5stack/M5HAL