[clang-format] Top-level unwrapped lines don't follow a left brace

Differential Revision: https://reviews.llvm.org/D109752

clang/lib/Format/UnwrappedLineParser.cpp

@@ -431,7 +431,7 @@ void UnwrappedLineParser::parseLevel(bool HasOpeningBrace) {
       }
       LLVM_FALLTHROUGH;
     default:
-      parseStructuralElement(/*IsTopLevel=*/true);
+      parseStructuralElement(!HasOpeningBrace);
       break;
     }
   } while (!eof());