fix sign error in limit_accretion_rates (for novae)

fix derivative labels

src/binary_c_derivatives.h

@@ -148,6 +148,8 @@
         "Central helium",                       \
         "Central carbon",                       \
         "He core mass (no 3DUP)",               \
+        "Number of thermal pulses",             \
+        "Number of thermal pulses since mcmin", \
         "nova H layer mass",                    \
         "Roche radius"                          \
     }

src/binary_star_functions/limit_accretion_rates.c

@@ -409,7 +409,7 @@ void limit_accretion_rates(struct stardata_t * RESTRICT const stardata)
                                      * Remove all the accreted layer : anything 
                                      * remaining becomes part of the white dwarf.
                                      */
-                                    accretor->derivative[DERIVATIVE_STELLAR_H_LAYER_MASS] -=
+                                    accretor->derivative[DERIVATIVE_STELLAR_H_LAYER_MASS] +=
                                         dm_loss_rate;
                                     
                                     /*