Set default buffering time to 1000ms

After a mac just boots up, it often takes about 700 milliseconds for
audio devices to work on first use, so it would often have issues with
the 700ms audio buffering time, and audio data would get cut off.  Just
increasing the buffering a little bit fixes the issue.

obs/obs-app.cpp

@@ -99,7 +99,7 @@ bool OBSApp::InitGlobalConfigDefaults()
 	config_set_default_uint(globalConfig, "Audio", "SampleRate", 44100);
 	config_set_default_string(globalConfig, "Audio", "ChannelSetup",
 			"Stereo");
-	config_set_default_uint(globalConfig, "Audio", "BufferingTime", 700);
+	config_set_default_uint(globalConfig, "Audio", "BufferingTime", 1000);
 
 	return true;
 }