Correct opencv headers

This is needed for OpenCV-4.5.0

Signed-off-by: Nicolas Chauvet <kwizart@gmail.com>

facedetect.cc

@@ -26,10 +26,10 @@ extern "C" {
 #include "ext/standard/info.h"
 #include "php_facedetect.h"
 
-#include <opencv2/core/core.hpp>
-#include <opencv2/highgui/highgui.hpp>
-#include <opencv2/imgproc/imgproc.hpp>
-#include <opencv2/objdetect/objdetect.hpp>
+#include <opencv2/core.hpp>
+#include <opencv2/highgui.hpp>
+#include <opencv2/imgproc.hpp>
+#include <opencv2/objdetect.hpp>
 
 
 using namespace cv;