PR: Fix role not being initialised correctly in scr_add_man (#327)

## Summary by Sourcery

Bug Fixes:
- Fixed a bug where the unit's role was not initialised correctly when
adding a new man.

scripts/scr_add_man/scr_add_man.gml

@@ -203,6 +203,7 @@ function scr_add_man(man_role, target_company, spawn_exp, spawn_name, corruption
 		}
 
 		unit.add_exp(spawn_exp);
+		unit.update_role(man_role);
 
 		obj_ini.age[target_company][good] = ((obj_controller.millenium * 1000) + obj_controller.year); // Age here // Note: age for marines is generated later with roll_age(), this is left here as a fallback