Update Xi(1820) resonance IDs in GeneratorLF

Author: hkoley

MC/config/PWGLF/ini/tests/GeneratorLF_ResonancesBaryonic_pp1360_injection.C

@@ -10,10 +10,10 @@ int External()
         -102134,   // Lambda(1520)0bar
         3324,      // Xi(1530)0
         -3324,     // Xi(1530)0bar
-        103314,  // Xi(1820)-
-        -103314, // Xi(1820)+
-        103324,  // Xi(1820)0
-        -103324  // Xi(1820)0bar
+        123314,  // Xi(1820)-
+        -123314, // Xi(1820)+
+        123324,  // Xi(1820)0
+        -123324  // Xi(1820)0bar
     };
     std::vector<std::vector<int>> decayDaughters = {
         {2212, -321}, // Lambda(1520)0