Fix logging of WARP location in ExecTests

[alsepkow]

We changed the type of the string to fix a build related issue in another repo that ingests DXC source. When we did that we ended up with an incorrect format character for printing the string.

Fixed and verified locally that logging is working properly again.

[Copilot]

Pull Request Overview

This PR fixes the logging message in the HLSL execution tests by correcting the format specifier used to print a wide string.

• Changed format specifier from %S to %ls so that the full module file path is printed correctly.

Comments suppressed due to low confidence (1)

tools/clang/unittests/HLSLExec/ExecutionTest.cpp:828

• Changing the format specifier from %S to %ls correctly matches the wide string type for szFullModuleFilePath. Ensure that similar logging calls throughout the codebase use the appropriate specifier.

L"WARP driver loaded from: %ls", szFullModuleFilePath));