PICARD-3030: Fix crash when merging original values for multiple tags #2577
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Summary
Problem
This refactors the change from PICARD-3021 to address a crash when selecting more then one changed tag in the metadatabox and then open the context menu.
Solution
Avoid the crash by implementing merge originals similar to the existing use originals.
Also refactor use original values a bit to reduce code duplication and harmonize the implementation of both merge and use originals.