PERF: use class instead of value_3 as cfield in the test because it produces a...

PERF: use class instead of value_3 as cfield in the test because it produces a simpler (hence lighter) model

Modules/Applications/AppClassification/test/CMakeLists.txt

@@ -996,8 +996,8 @@ if(OTB_USE_OPENCV)
   otb_test_application(NAME apTvClTrainVectorRegression
     APP  TrainVectorRegression
     OPTIONS -io.vd ${INPUTDATA}/Classification/apTvClSampleExtractionOut.sqlite
-    -feat value_0 value_1 value_2
-    -cfield value_3
+    -feat value_0 value_1 value_2 value_3
+    -cfield class
     -classifier rf
     -io.out ${TEMP}/apTvClTrainVectorRegressionModel.rf
     VALID   ${ascii_comparison}