Update WTSFreeMemoryEx to WTSFreeMemory (#5642)
Update WTSFreeMemoryEx to WTSFreeMemory (#5642)

Change `WTSFreeMemoryEx` to `WTSFreeMemory` as documented.

More context in:
- https://github.com/osquery/osquery/issues/4655
- http://redplait.blogspot.com/2018/06/interesting-case-of-memory-leak.html

Thanks for the bug report (redplait)[https://github.com/redplait]

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