Mms:Fix can't pop up slot selection when send a new SMS

If the recipients editor is visible,will not show slot selection
and send message directly.

When the recipients editor is visible and multi sim is enable
add sendMsimMessage() to show slot selection.

CRs-Fixed: 752417

Change-Id: Ia9422f41a2962f61ba4e58ad8b0594e5d7e4eca6