Change the default ffms audio error handling mode to ignore

Truncating the file at the first decoding error seems to cause a lot of
confusion, especially since the UI doesn't mention that it happened
anywhere.

src/libresrc/default_config.json

@@ -325,7 +325,7 @@
 				"Sample Rate" : 0
 			},
 			"FFmpegSource" : {
-				"Decode Error Handling" : "stop"
+				"Decode Error Handling" : "ignore"
 			}
 		},
 		"Avisynth" : {

src/libresrc/osx/default_config.json

@@ -325,7 +325,7 @@
 				"Sample Rate" : 0
 			},
 			"FFmpegSource" : {
-				"Decode Error Handling" : "stop"
+				"Decode Error Handling" : "ignore"
 			}
 		},
 		"Avisynth" : {