Protobuf format jar does not contain shaded artifact if using `jar` packaging (does with `bundle`)

Something in the change to "jar" packaging type (to keep Timestamps in classes wrt Reproducible Builds) broke Shade plugin, so that jar for protobuf format module no longer contains shared `Protoparser`.

Would be good to find what causes this; until then, need to revert change and use build type "bundle" to keep module actually working.

