[nobug, api update] Use WKWebsiteDataStore.allWebsiteDataTypes when clearing private data

[garvankeeley]

I found this function when browsing the API, we should be using it.

[mozillamobilebot]

SwiftLint found issues

Warnings

File	Line	Reason
Tab.swift	192	Colons should be next to the identifier when specifying a type and next to the key in dictionary literals. (colon)
Tab.swift	364	Prefer empty collection over optional collection. (discouraged_optional_collection)
Tab.swift	368	Prefer empty collection over optional collection. (discouraged_optional_collection)
Tab.swift	562	Prefer empty collection over optional collection. (discouraged_optional_collection)
Tab.swift	257	Limit vertical whitespace to a single empty line. Currently 2. (vertical_whitespace)

Errors

File	Line	Reason
Tab.swift	397	There should be no space before and one after any comma. (comma)

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