Add a negated balance entry.

The reason for this is that with OKQ8-VISA, "Saldo" (balance) means
"used credit" which is kind of backwards compared to how most other
accounts work.

src/com/liato/bankdroid/banking/banks/OKQ8.java

@@ -193,6 +193,7 @@ public void update() throws BankException, LoginException, BankChoiceException {
 			if(matcher.find())
 			{
 			    accounts.add(new Account("Saldo" , Helpers.parseBalance(matcher.group(1)), "2"));
+			    accounts.add(new Account("Saldo" , Helpers.parseBalance(matcher.group(1)).negate(), "4"));
 			}
 			/*
 			 * Find the next value that is "Köpgräns". Add a new account but don't add to the balance.