Fix #1018: Number of brems events miscounted for DBS in BEAM

Fix the output message in the egslst file for BEAMnrc simulations about
the number of brems events the took place. When DBS was turned on, it
would always read zero.

HEN_HOUSE/omega/beamnrc/beamnrc.mortran

@@ -6422,6 +6422,9 @@ ELSEIF(IBRSPL=2) ["directional bremsstrahlung splitting"
            ZLAST(I)=Z(I);
          ]
        ]
+
+       IF(IARG=6) NUM_BREM=NUM_BREM+nbr_split;
+
        " now put a zero weight particle on top of the stack thus forcing "
        " a return to shower. "
        np=np+1;