butterflies: removed unused variable

src/modules/butterflies/butterflies_populations.c

@@ -46,7 +46,8 @@ void bf_cell_maturation(struct cats_grid *grid, struct cats_thread_info *ts, cat
                 exit(EXIT_FAILURE);
         }
 
-        int orig_eggs = data->eggs[row][col];
+        //int orig_eggs = data->eggs[row][col];
+        
         // the number of generations per cell is usually not an integer value
         // the non-integer part of the number of generations is used in the generation which is
         // one greater than the integer part of the number of generations