Remove no longer used webkit2gtk dependency
The Browser Preview plugin that used it was removed in https://github.com/elementary/code/commit/f8ef42c85ee9b497ad3bcdd3e5db97beb947fe02.
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The Browser Preview plugin that used it was removed in https://github.com/elementary/code/commit/f8ef42c85ee9b497ad3bcdd3e5db97beb947fe02.