tapi examples - Removing defaults from all command line switches accessed with has()

samples/tapi/tvl1_optical_flow.cpp

@@ -83,12 +83,12 @@ static void getFlowField(const Mat& u, const Mat& v, Mat& flowField)
 int main(int argc, const char* argv[])
 {
     const char* keys =
-        "{ h help     | false           | print help message }"
+        "{ h help     |                 | print help message }"
         "{ l left     |                 | specify left image }"
         "{ r right    |                 | specify right image }"
         "{ o output   | tvl1_output.jpg | specify output save path }"
         "{ c camera   | 0               | enable camera capturing }"
-        "{ m cpu_mode | false           | run without OpenCL }"
+        "{ m cpu_mode |                 | run without OpenCL }"
         "{ v video    |                 | use video as input }";
 
     CommandLineParser cmd(argc, argv, keys);