single thread SAM by default

libi2pd/Config.cpp

@@ -131,7 +131,7 @@ namespace config {
 			("sam.enabled", value<bool>()->default_value(true),               "Enable or disable SAM Application bridge")
 			("sam.address", value<std::string>()->default_value("127.0.0.1"), "SAM listen address")
 			("sam.port", value<uint16_t>()->default_value(7656),              "SAM listen port")
-			("sam.singlethread", value<bool>()->default_value(false),         "Sessions run in the SAM bridge's thread")
+			("sam.singlethread", value<bool>()->default_value(true),         "Sessions run in the SAM bridge's thread")
 		;
 
 		options_description bob("BOB options");