Set default certificate type in Configuration

include/rtc/configuration.hpp

@@ -76,7 +76,7 @@ struct RTC_CPP_EXPORT Configuration {
 	optional<ProxyServer> proxyServer; // libnice only
 
 	// Options
-	CertificateType certificateType = CertificateType::Ecdsa;
+	CertificateType certificateType = CertificateType::Default;
 	bool enableIceTcp = false;
 	bool disableAutoNegotiation = false;
 

include/rtc/rtc.h

@@ -89,7 +89,7 @@ typedef enum { // Don't change, it must match plog severity
 } rtcLogLevel;
 
 typedef enum {
-	RTC_CERTIFICATE_DEFAULT = 0,
+	RTC_CERTIFICATE_DEFAULT = 0, // ECDSA
 	RTC_CERTIFICATE_ECDSA = 1,
 	RTC_CERTIFICATE_RSA = 2,
 } rtcCertificateType;