Correctly handle liquid's birthday when stored into standing tanks (#…

…63760)

* Handle the bday of liquid

src/iexamine.cpp

@@ -3641,12 +3641,14 @@ void iexamine::keg( Character &you, const tripoint &examp )
         std::vector<itype_id> drink_types;
         std::vector<std::string> drink_names;
         std::vector<double> drink_rot;
+        std::vector<time_point> drink_bday;
         for( item *&drink : drinks_inv ) {
             auto found_drink = std::find( drink_types.begin(), drink_types.end(), drink->typeId() );
             if( found_drink == drink_types.end() ) {
                 drink_types.push_back( drink->typeId() );
                 drink_names.push_back( item::nname( drink->typeId() ) );
                 drink_rot.push_back( drink->get_relative_rot() );
+                drink_bday.push_back( drink->birthday() );
             } else {
                 auto rot_iter = std::next( drink_rot.begin(), std::distance( drink_types.begin(), found_drink ) );
                 // Yep, worst rot wins.
@@ -3676,7 +3678,7 @@ void iexamine::keg( Character &you, const tripoint &examp )
         //Store liquid chosen in the keg
         itype_id drink_type = drink_types[ drink_index ];
         int charges_held = you.charges_of( drink_type );
-        item drink( drink_type, calendar::turn_zero );
+        item drink( drink_type, drink_bday[ drink_index ] );
         drink.set_relative_rot( drink_rot[ drink_index ] );
         drink.charges = 0;
         bool keg_full = false;