fixed remaining warnings

Signed-off-by: Konstantin Läufer <[email protected]>

matrix_mul/matrix_mul_dpcpp.cpp

@@ -69,7 +69,7 @@ int main() {
   // Initialize the device queue with the default selector. The device queue is
   // used to enqueue kernels. It encapsulates all states needed for execution.
   try {
-    queue q(default_selector{}, dpc_common::exception_handler);
+    sycl::queue q{sycl::default_selector_v, dpc_common::exception_handler};
 
     cout << "Device: " << q.get_device().get_info<info::device::name>() << "\n";