Revert "Mms: Dispaly wrong text message limit for per conversation"

This made the input number to be shown wrong again. Also, all
custom Mms configs in device overlays are using the value 10000.
Changing all of them to 1000 would be a real pain.

This reverts commit 42aacd7768be263cb6aace84d4f4e332c30b3445.

Change-Id: I0e2d11ef752a0cba9207e0e2399ffbf2867865e0