I20220316-1800
dialog under high contrast theme - Adjusted background for 'Composite' under high contrast theme Change-Id: I28e66fd07a6c513f0926b8b4b8163e3aa1d6a519 Signed-off-by: Niraj Modi <niraj.modi@in.ibm.com> Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.ui/+/191947