Add bangs to Presearch

[davidcollini]

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Bangs in DuckDuckGo and Brave Search are a huge part of my workflow and Presearch is very tedious without them

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Add DuckDuckGo bangs to Presearch

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The current system of picking pre-selected search engines isn't accessible through the main search bar with presearch as the default search engine, so that's not an alternative

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