Update VecAddMoveOnlyFunctor and VecAddWithIsSupportedMethod with Def…

…ault constructor (microsoft#17705)

### Description
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### Motivation and Context
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onnxruntime/test/framework/tunable_op_test.cc

@@ -263,8 +263,7 @@ TEST(TunableOp, OpWrapsMutableFunctor) {
 
 class VecAddMoveOnlyFunctor {
  public:
-  VecAddMoveOnlyFunctor() {
-  }
+  VecAddMoveOnlyFunctor() = default;
   VecAddMoveOnlyFunctor(VecAddMoveOnlyFunctor&&) = default;
   ORT_DISALLOW_COPY_AND_ASSIGNMENT(VecAddMoveOnlyFunctor);
 
@@ -290,8 +289,7 @@ TEST(TunableOp, OpWrapsMoveOnlyFunctor) {
 
 class VecAddWithIsSupportedMethod {
  public:
-  VecAddWithIsSupportedMethod() {
-  }
+  VecAddWithIsSupportedMethod() = default;
   VecAddWithIsSupportedMethod(VecAddWithIsSupportedMethod&&) = default;
   ORT_DISALLOW_COPY_AND_ASSIGNMENT(VecAddWithIsSupportedMethod);