DescriptionField: rework syncing changes from VE to textarea

Instead of relying on the 'blur' event of the VE document model which apparently isn't always called, or instead of using 'transact' to intercept every keystroke, we simply tell WishlistIntake to call the sync method before submission.

See the 'Source editor' section at T368539 for repro steps.

Bug: T368539

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