Testing: Test if LocationIDs are properly updated when merging

[AndreasSko]

While working on #52 I noticed that for Notes and TagMaps the merging tests don't notice if

go-jwlm/cmd/merge.go

Line 71 in a938374

merger.UpdateLRIDs(left.Note, right.Note, "LocationID", locationIDChanges)

and

go-jwlm/cmd/merge.go

Line 72 in a938374

merger.UpdateLRIDs(left.TagMap, right.TagMap, "LocationID", locationIDChanges)

are commented out. There is a similar issue in:

go-jwlm/gomobile/Merge.go

Line 17 in a938374

merger.UpdateLRIDs(dbw.leftTmp.Note, dbw.rightTmp.Note, "LocationID", locationIDChanges)

.
The tests should be updated to fail if LocationsIDs are not properly updated.