Inject more particles per event

(cherry picked from commit c399748)

Author: fmazzasc

MC/config/PWGLF/pythia8/generator/hypernuclei_pbpb.gun

@@ -1,8 +1,8 @@
 # PDG           N      ptMin   ptMax   yMin   yMax
-1000010020      10     0.2     10      -1     1
-1000010030      10     0.2     10      -1     1
-1000020030      10     0.2     10      -1     1
-1000020040      10     0.2     10      -1     1
-1010010030      10     0.2     10      -1     1
-1010010040      10     0.2     10      -1     1
-1010020040      10     0.2     10      -1     1
+1000010020      20     0.2     10      -1     1
+1000010030      20     0.2     10      -1     1
+1000020030      20     0.2     10      -1     1
+1000020040      20     0.2     10      -1     1
+1010010030      20     0.2     10      -1     1
+1010010040      20     0.2     10      -1     1
+1010020040      20     0.2     10      -1     1