[SYCL][NFC] Use /clang:-std= instead of /std: to set C++ standard (#18828)

The two options are similar but `/clang:-std=` works for C++ 23 on
Windows.

---------

Signed-off-by: Michael Aziz <[email protected]>
Co-authored-by: Michael Toguchi <[email protected]>

Author: 0x12CC

sycl/test-e2e/lit.cfg.py

@@ -574,7 +574,7 @@ def open_check_file(file_name):
     )
     config.substitutions.append(("%include_option", "/FI"))
     config.substitutions.append(("%debug_option", "/Zi /DEBUG"))
-    config.substitutions.append(("%cxx_std_option", "/std:"))
+    config.substitutions.append(("%cxx_std_option", "/clang:-std="))
     config.substitutions.append(("%fPIC", ""))
     config.substitutions.append(("%shared_lib", "/LD"))
     config.substitutions.append(("%O0", "/Od"))