Fix for !1793 (JVET-R0270): Considering CRA that is preceded by EOS

Hendryrequested to merge
hendry197/VVCSoftware_VTM:FixForR0270Implementation into master

This is also handling the special case such as encoding and decoding of SlideShow sequence in which there is no trail or stsa picture between two IRAPs

Edited by Karsten Suehring

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