[iSE] Stats do not initialize correctly

[Manimu]

The "Total Stats'-section in the screens Inventory, Shop and Enchanter do not initialize all values, when opened the first time:

-MP is always "100 (+0)"
-HP shows the modifier "(+0)" and the HP-value do not consider the modifier.

If some item in the inventory is changed (even if it is only updated back to the same item), then these fields update correctly to the expected values.