Put date into field that was used to activate DatePicker instead of currectly focused...

Put date into field that was used to activate DatePicker instead of currectly focused field.

[Title] Show date in the correct field after DatePicker closes. Remember field that activated DatePicker and use it instead of focused field.
[Issue] N_SE-52629
[Problem] Date value is inserted into focused fields, which might not be date field that activated DatePicker.
[Cause] When asyncronic event is sent from WebProcess to UIProcess, for a short while focus chaning events are still active on page and can lead to focus move.
In order to put new text into correct field, we not longer put new text into focused field, but store the target node and store new text into this target node.
[Solution] Insert date value into last clicked or entered field.

Change-Id: Idbe7d9dadb8d68ab2c342e249a6137d7a533eb43