Util: Use C++20 designated initializer lists on structs

src/util/format/formatter.cpp

@@ -46,7 +46,7 @@ void Formatter<const char*>::parse(Parser& parser)
 void Formatter<const char*>::format(Builder& builder, const char* value) const
 {
 	if (specifier.type == PresentationType::Pointer) {
-		Formatter<const void*> formatter { specifier };
+		Formatter<const void*> formatter { .specifier = specifier };
 		formatter.format(builder, static_cast<const void*>(value));
 		return;
 	}

src/util/format/formatter.h

@@ -95,7 +95,7 @@ struct Formatter<T> {
 		if (specifier.type == PresentationType::Character) {
 			assert(value >= 0 && value <= 127);
 
-			Formatter<std::string_view> formatter { specifier };
+			Formatter<std::string_view> formatter { .specifier = specifier };
 			formatter.specifier.type = PresentationType::String;
 			return formatter.format(builder, { reinterpret_cast<const char*>(&value), 1 });
 		}