Make query parameters without = have empty string values #2098
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This was reverted in 77cf057 so that Rails could have historical Rack behavior without the complexity of splitting form/query parsing.
Now that splitting form/query parsing has been added back in 3855d1d, this changes the behavior to what originally shipped in Rack 3.
This matches URL spec section 5.1.3.3. Frameworks that want Rack's historical behavior of using nil values instead of empty string values can reparse QUERY_STRING and use rack.request.form_pairs to get the behavior they want.