Add Sherpa Decaydata file with fix for D->K*K BR
Based on PDG bugfix clarified by Marjorie Shapiro, cf. also https://gitlab.com/sherpa-team/decaydata/-/commit/af49fe3b
Based on PDG bugfix clarified by Marjorie Shapiro, cf. also https://gitlab.com/sherpa-team/decaydata/-/commit/af49fe3b