[skia] Fix vswhere.exe can't find VS2017 with -sort

[LilyWangL]

Fix vswhere.exe can't find VS2017 with the error as below:

ERROR at //gn/BUILDCONFIG.gn:133:29: Script returned non-zero exit code.
    win_toolchain_version = exec_script("//gn/highest_version_dir.py",
                            ^----------
Current dir: F:/0315/vcpkg/buildtrees/skia/x64-windows-dbg/
Command: F:/0315/vcpkg/downloads/tools/python/python-2.7.16-x64/python.exe F:/0315/vcpkg/buildtrees/skia/src/3c01b69efb-0a98da8354/gn/highest_version_dir.py "Visual Studio Locator version 2.5.2+gebb9f26a3d [query version 1.18.21.37008]\VC/Tools/MSVC" "[0-9]{2}\.[0-9]{2}\.[0-9]{5}"
Returned 1.

I used the command to find VS on cmd, and I got the error as below:

C:\Program Files (x86)\Microsoft Visual Studio\Installer>vswhere.exe -prerelease -legacy -products * -sort -utf8 -property installationPath
Visual Studio Locator version 2.5.2+gebb9f26a3d [query version 1.18.21.37008]
Copyright (C) Microsoft Corporation. All rights reserved.

Error 0x57: Unknown parameter: sort

I have submit an issue on the source page: microsoft/vswhere#216
No features need to test.

[dan-shaw]

/azp run