[SYCL] Fix unittest initialization of queue with selector (#6540)

#6486 added new queue constructors for
the use of callable device selectors. In accordance with SYCL 2020 these
constructors are marked explicit and as such implicit conversion from
initializer lists does not work. These changes fixes the Wait.cpp
unittest to use the explicit constructor.

Signed-off-by: Larsen, Steffen <[email protected]>

Author: steffenlarsen

sycl/unittests/queue/Wait.cpp

@@ -174,7 +174,7 @@ TEST(QueueWait, QueueWaitTest) {
   // Test behaviour for emulating an OOO queue with multiple in-order ones.
   TestContext = {};
   TestContext.SupportOOO = false;
-  Q = {Ctx, default_selector()};
+  Q = queue{Ctx, default_selector()};
   Q.memset(HostAlloc, 42, 1);
   // The event is kept alive in this case to call wait.
   ASSERT_EQ(TestContext.EventReferenceCount, 1);