appsdk-bump-app-catalog 274 bumping sdk to 1454-dc7f621

sdk commit: RallySoftware/appsdk@fd0a053dbd5f821718a41af1515085865ce401b2
author: Matt Greer and Doug Diehnelt
message: Revert "Revert "DE19636: TreeGrid - Iteration Tracking Board App Hack for rowsizing when a column wraps.""