Revert "Add support for user preferences (im via email)"

This reverts commit 1842388bb4.

OpenSim/Data/SQLite/Resources/UserProfiles.migrations

@@ -88,15 +88,3 @@ CREATE TABLE IF NOT EXISTS userdata (
 
 commit;
 
-
-:VERSION 3         # -------------------------------
- 
-begin;
-CREATE TABLE IF NOT EXISTS usersettings (
-  useruuid char(36) NOT NULL,
-  imviaemail binary(1) NOT NULL,
-  visible binary(1) NOT NULL,
-  email varchar(254) NOT NULL,
-  PRIMARY KEY (useruuid)
-)
-commit;