fix: remove duplicate old code in weapon_selector _on_select

- Remove duplicate code block that used 'ammo' instead of 'ammo_burn'
- The old code was left behind after adding try/except wrapper

ui/weapon_selector.py

@@ -261,20 +261,6 @@ class WeaponSelectorDialog(QDialog):
             self.preview_name.setText(str(weapon.name) if weapon.name else "Unknown")
             self.preview_cost.setText("Error")
             self.ok_btn.setEnabled(False)
-        
-        # Calculate cost per shot
-        decay_pec = Decimal(str(weapon.decay))
-        ammo = Decimal(str(weapon.ammo))
-        cost_per_shot = (decay_pec / Decimal("100")) + (ammo * Decimal("0.0001"))
-        
-        # Update preview
-        self.preview_name.setText(weapon.name)
-        self.preview_damage.setText(str(weapon.damage))
-        self.preview_decay.setText(f"{weapon.decay} PEC")
-        self.preview_ammo.setText(str(weapon.ammo))
-        self.preview_cost.setText(f"{cost_per_shot:.4f} PED")
-        
-        self.ok_btn.setEnabled(True)
     
     def _on_double_click(self, item):
         """Double-click to select immediately."""