clean the code

source/sample/transformer/T2TAttention.cpp

@@ -182,7 +182,7 @@ XTensor T2TAttention::MakeAttention(XTensor &k, XTensor &q, XTensor &v, XTensor
     dot = Linear(dot, 1.0F/(float)sqrt((float)dk/nhead));
     
     scalar = Softmax(dot, -1);
-    
+
     if(isTraining && dropoutP > 0)
         scalar = Dropout(scalar, dropoutP);