QuickMessagePopup: pager fix on multiple messages.

Fixed the pager to
* keep the already typed replies for each message, and
* retain the typing focus on the current message reply's EditText.

Change-Id: I48bc7e5c597dd31ae13a6ce81f33f870f9ec2be8
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_packages_apps_Mms into kk_mkt