Improved morale with undead army

When the player has an undead army, the moral does not apply. The issue is that the info is still (partially calculated)
and displayed. The artifacts are taken into consideration but not the skills / tavern.
With this commit the morale is always calculated & displayed in the hero menu.

src/fheroes2/army/army.cpp

@@ -1207,18 +1207,13 @@ int Army::GetMoraleModificator( std::string * strs ) const
     // different race penalty
     std::set<int> races;
     bool hasUndead = false;
-    bool allUndead = true;
 
     for ( const Troop * troop : *this )
         if ( troop->isValid() ) {
             races.insert( troop->GetRace() );
             hasUndead = hasUndead || troop->isUndead();
-            allUndead = allUndead && troop->isUndead();
         }
 
-    if ( allUndead )
-        return Morale::NORMAL;
-
     int result = Morale::NORMAL;
 
     // check castle modificator