Style: Apply new changes from clang-format 8.0

It seems to stay compatible with formatting done by clang-format 6.0 and 7.0,
so contributors can keep using those versions for now (they will not undo those
changes).

core/variant_parser.cpp

@@ -1948,7 +1948,8 @@ Error VariantWriter::write(const Variant &p_variant, StoreStringFunc p_store_str
 			p_store_string_func(p_store_string_ud, " )");
 
 		} break;
-		default: {}
+		default: {
+		}
 	}
 
 	return OK;