[Patch, Fortran] PR51514 - fix passing a CLASS to a TYPE

[Tobias Burnus]

When passing a CLASS to a TYPE, the "_data" component wasn't added for 
scalar variables. (Polymorphic arrays are/were handled correctly.)

This patch adds the _data, fixing this wrong-code issue.

Build and regtested on x86-64-linux.
OK for the trunk?

Tobias
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