appsdk-bump-app-catalog 416 bumping sdk to 1858-6fe6772

sdk commit: RallySoftware/appsdk@6fe6772e653c4f5668f95dc3bf4f3af6f435f57a
author: Robb Lee and Dave Thompson
message: S63401: Refactor TreeGrid model/store config and fixing column sizing and scroll bar issues.