fixed json serializer float check

core/Vanguard/VanguardHelpers.cpp

@@ -244,6 +244,8 @@ void FormatJsonData(VanguardSettings& settings, std::ostringstream& json_string)
 	// iterate through all settings
 	for (int i = 0; i < settings.array.size(); i++)
 	{
+		std::string value(settings.to_string(settings.array[i].second));
+
 		// flycast stores bools as "yes" and "no" so we need this hack
 		if (std::holds_alternative<bool>(settings.array[i].second))
 		{
@@ -264,8 +266,12 @@ void FormatJsonData(VanguardSettings& settings, std::ostringstream& json_string)
 				<< "\": " << settings.to_string(settings.array[i].second);
 		}
 
+		json_string << "  \"" << settings.array[i].first
+			<< "\": " << value;
+
 		// if the value is a whole number float, add ".0" so the parser understands
-		if (std::holds_alternative<float>(settings.array[i].second))
+		if (std::holds_alternative<float>(settings.array[i].second) &&
+			value.length() == 1)
 		{
 			json_string << ".0";
 		}