Clang-Format: Allow empty functions to be single-line

For example

```
OIIOOutputDriver::~OIIOOutputDriver()
{
}
```

becomes

```
OIIOOutputDriver::~OIIOOutputDriver() {}
```

Saves quite some vertical space, which is especially handy for
constructors.

Pull Request: blender/blender#105594

source/blender/functions/tests/FN_field_test.cc

@@ -30,9 +30,7 @@ TEST(field, ConstantFunction)
 
 class IndexFieldInput final : public FieldInput {
  public:
-  IndexFieldInput() : FieldInput(CPPType::get<int>(), "Index")
-  {
-  }
+  IndexFieldInput() : FieldInput(CPPType::get<int>(), "Index") {}
 
   GVArray get_varray_for_context(const FieldContext & /*context*/,
                                  IndexMask mask,