fixed: Image did not use 'savelog' when creating logs

before commit 4832c7db4b the logs were lost, but after 4832c7db4b
the logs were printed when winix shuts down

in 4832c7db4b at the end of BaseThread::StartRoutine()
has been added a call to save_log()

winixd/core/image.cpp

@@ -581,6 +581,8 @@ void Image::CreateImage()
 				<< ", 'convert' process returned: " << res << logend;
 		}
 	}
+
+	log << logsave;
 }