Fix build failure in rgbd's test

Fixes the following compiler error:

  rgbd/test/test_dynafu.cpp:44:17: error: 'Params' is not a member of 'cv::dynafu'
     44 |     Ptr<dynafu::Params> params;
        |                 ^~~~~~

modules/rgbd/test/test_dynafu.cpp

@@ -41,11 +41,11 @@ static const bool display = false;
 
 void flyTest(bool hiDense, bool inequal)
 {
-    Ptr<dynafu::Params> params;
+    Ptr<kinfu::Params> params;
     if(hiDense)
-        params = dynafu::Params::defaultParams();
+        params = kinfu::Params::defaultParams();
     else
-        params = dynafu::Params::coarseParams();
+        params = kinfu::Params::coarseParams();
 
     if(inequal)
     {