Initialize controls correctly

Initialize controls correctly as "controls::controls"

This is necessary to stop the IPA process from aborting if it is
running in "isolation" mode.

mjpg-streamer-experimental/plugins/input_libcamera/input_libcamera.cpp

@@ -124,7 +124,7 @@ int input_init(input_parameter *param, int plugin_no)
     context *pctx;
     context_settings *settings;
     int ret;
-    ControlList controls_;
+    ControlList controls_(controls::controls);
     int64_t frame_time;
     bool controls_flag = false;