Fix duplication of braces around const generic argument in non-full mode #1482
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Fixes serde-rs/serde#2414.
In non-"full" mode, syn parses
Generic<{ BAR as u8 }>with a GenericArgument::Const containing Expr::Verbatim (because the data structures for Expr::Block are not available). But then, it wrongly printed that out asGeneric<{ { BAR as u8 } }>, leading to bogus warnings in generated code.