Bad formatting of lambda with attribute

C# 10 allows lambda expressions to have attributes. dotnet-format seems to force the lambda to be unindented when putting a lambda attribute on a separate line:

Before:
```csharp
var l =
[MyAttr]
() => 0;
```

After running `dotnet-format`:
```csharp
var l =
[MyAttr]
() => 0;
```