Do not use std::remove_cvref_t, does not exist in C++17, use custom one.

Author: krithalith

include/ck/tensor_operation/gpu/thread/threadwise_tensor_slice_transfer_v7r3.hpp

@@ -286,7 +286,7 @@ struct ThreadwiseTensorSliceTransfer_v7r3
 
             static_for<0, nDst, 1>{}([&](auto i) {
                 using elm_vector_t = typename remove_cvref_t<decltype(elm_vectors[i])>::type;
-                using scalar_t     = std::remove_cvref_t<
+                using scalar_t     = typename remove_cvref_t<
                         decltype(elm_vectors(i).template AsType<elm_vector_t>()[I0])>;
 
                 // This is a bit ugly but necessary to be able to compile f8 instances for grouped