[OpenCL] Fix UR_ADAPTER_INFO_BACKEND value

Author: callumfare

source/adapters/opencl/adapter.cpp

@@ -66,7 +66,7 @@ UR_APIEXPORT ur_result_t UR_APICALL urAdapterGetInfo(ur_adapter_handle_t,
 
   switch (propName) {
   case UR_ADAPTER_INFO_BACKEND:
-    return ReturnValue(UR_ADAPTER_BACKEND_CUDA);
+    return ReturnValue(UR_ADAPTER_BACKEND_OPENCL);
   case UR_ADAPTER_INFO_REFERENCE_COUNT:
     return ReturnValue(adapter.RefCount.load());
   default: