MMS: Fix display session mode after send message

It won't exit send will query message list in ComposeMessageActivity
after send a message in folder mode.

Do not query and show message list in folder mode.
Exit ComposeMessageActivity after send a message in folder mode.

CRs-Fixed: 659985

Change-Id: Iae51c25ad68c9c59815620d9538e13c982df2406