Fix initialization of AAC presentation struct

Otherwise the new size checks trip on this.

Bug: 27207275
Change-Id: I1f8f01097e3a88ff041b69279a6121be842f1766

ACodec::LoadedState::LoadedState(ACodec *codec)
 : BaseState(codec) {
}

ACodec::LoadedState::LoadedState(ACodec *codec)
 : BaseState(codec) {
}
