fixes log_fatal to add the missing log to file

Previously this func would not log to the file, which means it wouldn't show in the godot.log during mod development. Note: Unlike the `"error"` condition, I've only used `push_error` instead of also using `printerr`, because `push_error` also seems to print the error already (incl. the `ERROR: ` prefix, which `printerr` doesn't include)

Author: ithinkandicode

addons/mod_loader/mod_loader_utils.gd

@@ -65,6 +65,7 @@ static func _loader_log(message: String, mod_name: String, log_type: String = "i
 
 	match log_type.to_lower():
 		"fatal-error":
+			push_error(message)
 			_write_to_log_file(log_message)
 			_write_to_log_file(JSON.print(get_stack(), "  "))
 			assert(false, message)