Update MetaTrader 4 for iPhone build 437

1. Fixed an error leading to the application crash when logging to an account with unsaved password.
2. Fixed an error that could occasionally lead to the application crash in iOS 6.
3. Some minor fixes.

The MetaTrader 4 for iPhone can be downloaded at https://download.mql5.com/cdn/mobile/mt4/ios?hl=en&utm_source=www.metaquotes.net