RD baryonic: XibmToL0PimMuE_LL decay descriptor fix

Fix to Hlt2RD_XibmToL0PimMuE_LL decay descriptor

• "[Xi_b- -> J/psi(1S) Lambda0 K-]cc" -> "[Xi_b- -> J/psi(1S) Lambda0 pi-]cc"

No change in bandwidth after the fix.