tune2fs: fix BUGs of tuning project quota

tune2fs: fix BUGs of tuning project quota

There are several problems for project quota enable/disable:
tune2fs -O ^project did not work, because @clear_ok_features
did not include @EXT4_FEATURE_RO_COMPAT_PROJECT.

update_feature_set() works for -O option, but tune2fs -Q prj/^prj
did not work well, because function handle_quota_options()
did not set and clear @EXT4_FEATURE_RO_COMPAT_PROJECT feature very well.

one warning message is removed, because with project feature
enabled, quota feature will be enabled automatically.

Signed-off-by: Wang Shilong <wshilong@ddn.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>