* x/distribution: fix module's parameters validation closes: #8914 * Update x/distribution/types/params.go Co-authored-by: Aleksandr Bezobchuk <alexanderbez@users.noreply.github.com> * Update x/distribution/types/params_internal_test.go Co-authored-by: Robert Zaremba <robert@zaremba.ch> Co-authored-by: Aleksandr Bezobchuk <alexanderbez@users.noreply.github.com> Co-authored-by: Robert Zaremba <robert@zaremba.ch>