ProQuest export DISS_degree and DISS_processing_code data source swap

[smutniak]

These fields result from data in field_value definition and identifier where field_predicate = thesis.degree.name
swapping the values for definition and identifier produces correct result, e.g
<DISS_degree>Ph.D.</DISS_degree>
<DISS_processing_code>D</DISS_processing_code>

which indicates that either vireo4 is storing values in the wrong column (definition vs identifier) or more likeluy the code generating the output needs to be fixed for which value it depends on.

zendesk ticket 14752