Fix ship-owners when control is given

src/gamecode/economy.c

@@ -638,6 +638,9 @@ static void give_control(unit * u, unit * u2)
       }
     }
   }
+  if (u->ship) {
+    u->ship->owner = u2;
+  }
   freset(u, UFL_OWNER);
   fset(u2, UFL_OWNER);
 }

src/kernel/unit.c

@@ -812,6 +812,7 @@ void leave_ship(unit * u)
       fset(owner, UFL_OWNER);
     }
   }
+  assert(sh->owner!=u);
 }
 
 void leave_building(unit * u)