Calendar: Selected item should be selected after rotation

It dismiss dialog when activity pause and create a new one
when it resume, but didn't save the selected state.

Save the selected state, and resotre the state when create
the dialog.

CRs-Fixed: 428296

Change-Id: Ia6df7cccc3914057f6b1d9e7dced596486b995d3
Calendar: Tap prev btn should goto prev input field

As the ime options attribute is not set for description textView, the
default behavior of long press enter button is "OK" but not "Prev".

Set the ime options attribute for description textView.

CRs-Fixed: 408601

Change-Id: I8acdcc53a00d4474eb27469424878b75efec8539
Calendar: Cursor remains constant after locking and unlocking

The focus will be cleared at the end of the thread.

Do not clear the focus and save the current focus state for resuming.

CRs-Fixed: BZ1200

Change-Id: I2fd1b8f67caaac0afef87959cafe5a56efed48a2