[oneMKL] Fixed namespace for math functions in Student's T-test. USM version

[andreyfe1]

Existing Sample Changes

Description

Replaced sycl:: with std:: for math functions in the Student's T-test sample (USM version)

External Dependencies

List any external dependencies created as a result of this change.

Type of change

Please delete options that are not relevant. Add a 'X' to the one that is applicable.

• [X] Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• [X] Command Line
• [ ] oneapi-cli
• [ ] Visual Studio
• [ ] Eclipse IDE
• [ ] VSCode
• [ ] When compiling the compliler flag "-Wall -Wformat-security -Werror=format-security" was used

[andreyfe1]

Adding @jimmytwei to merge changes