cvv: repair build

modules/cvv/src/qtutil/filter/diffFilterWidget.cpp

@@ -1,6 +1,5 @@
 #include <opencv2/core.hpp>
 #include <opencv2/imgproc.hpp>
-#include <opencv2/imgproc/types_c.h>
 
 #include <unordered_map>
 
@@ -14,6 +13,7 @@
 
 namespace cvv
 {
+using namespace cv;
 namespace qtutil
 {