Revert "Bug #217: Available money not updated in shipyard after purchasing a ship"

This reverts commit 77dbf11192d8a47729273fb6373c49edaf71d72f.
Revert "Revert "Bug #217: Available money not updated in shipyard after purchasing a ship""

This reverts commit ed569e9f4b81f7b6b52ca2ffeb68b6273af67adb.

bugfix introduces possible unintentional side effects