[stable9.1] Fix undefined OfflineUser::composeAndStoreDisplayName() -…#25601

DeepDiver1975 merged 1 commit intostable9.1owncloud/core:stable9.1from

stable9.1-13c326df1455294b4ff4383b06b8ca4e32b51bebowncloud/core:stable9.1-13c326df1455294b4ff4383b06b8ca4e32b51bebCopy head branch name to clipboard