renamed LATCH

samples/cpp/tutorial_code/xfeatures2D/LATCH_match.cpp

@@ -30,7 +30,7 @@ int main(void)
 
     Ptr<cv::ORB> orb_detector = cv::ORB::create(10000);
 
-    Ptr<xfeatures2d::LATCHDescriptorExtractor> latch = xfeatures2d::LATCHDescriptorExtractor::create();
+    Ptr<xfeatures2d::LATCH> latch = xfeatures2d::LATCH::create();
 
 
     orb_detector->detect(img1, kpts1);