Make ScalaObjectDeserializerModule part of DefaultScalaModule

[pjfanning]

For backward compatibility in jackson-module-scala v2.x, ScalaObjectDeserializerModule (#211) was not made part of DefaultScalaModule. This means users, need to explicitly add ScalaObjectDeserializerModule.

In jackson-module-scala v3.x, it will be part of DefaultScalaModule.

[pjfanning]

#647 makes same change for v2.16.0 release