Add underscore expressions for destructuring assignments

Co-authored-by: varkor <[email protected]>

Author: fanzier

clippy_lints/src/utils/sugg.rs

@@ -170,6 +170,7 @@ impl<'a> Sugg<'a> {
             | ast::ExprKind::MacCall(..)
             | ast::ExprKind::MethodCall(..)
             | ast::ExprKind::Paren(..)
+            | ast::ExprKind::Underscore
             | ast::ExprKind::Path(..)
             | ast::ExprKind::Repeat(..)
             | ast::ExprKind::Ret(..)