Bug 453981: setValue on AbstractProposalField doesn't refresh display

text properly

Changed duplicated class id for lookup call

Change-Id: I9647dd427d8b17b2e52f4d1e66bad46bc9d26a7c
Task-Url: https://bugs.eclipse.org/bugs/show_bug.cgi?id=453981
Reviewed-on: https://git.eclipse.org/r/37590
Tested-by: Hudson CI
Reviewed-by: Judith Gull <jgu@bsiag.com>
Reviewed-on: https://git.eclipse.org/r/37667