Call the branching dopair1_density function in test125cells.c.

tests/test125cells.c

@@ -432,6 +432,7 @@ void dump_particle_fields(char *fileName, struct cell *main_cell,
 
 /* Just a forward declaration... */
 void runner_dopair1_density(struct runner *r, struct cell *ci, struct cell *cj);
+void runner_dopair1_branch_density(struct runner *r, struct cell *ci, struct cell *cj);
 void runner_doself1_density(struct runner *r, struct cell *ci);
 void runner_dopair2_force(struct runner *r, struct cell *ci, struct cell *cj);
 void runner_doself2_force(struct runner *r, struct cell *ci);
@@ -643,7 +644,7 @@ int main(int argc, char *argv[]) {
 
                 struct cell *cj = cells[iii * 25 + jjj * 5 + kkk];
 
-                if (cj > ci) runner_dopair1_density(&runner, ci, cj);
+                if (cj > ci) runner_dopair1_branch_density(&runner, ci, cj);
               }
             }
           }