(svn r9467) -Fix(FS#703,6108): When resetting the array of currencies, the custom currency was reset too, thus loosing the setting a user could have used for it.(glx)

src/currency.h

@@ -40,7 +40,7 @@ extern CurrencySpec _currency_specs[NUM_CURRENCY];
 
 uint GetMaskOfAllowedCurrencies();
 void CheckSwitchToEuro();
-void ResetCurrencies();
+void ResetCurrencies(bool preserve_custom = true);
 StringID* BuildCurrencyDropdown();
 byte GetNewgrfCurrencyIdConverted(byte grfcurr_id);