Typo in source version of OpenGLWindows.h

The type definitions for the Enum Macros glObjectLabelKHR and glObjectPtrLabelKHR are misspelled.

Working in 4.19.2

Broken in 4.20

Tested 4.19.2 (CL - 4033788) and 4.20 (CL - 4214897)

1. Navigate to https://github.com/EpicGames/UnrealEngine/blob/staging-4.20/Engine/Source/Runtime/OpenGLDrv/Private/Windows/OpenGLWindows.h
2. Locate the declarations of glObjectLabelKHR and glObjectPtrLabelKHR

Expected: The EnumMacros type being PFNGLOBJECTLABELKHRPROC and PFNGLOBJECTPTRLABELKHRPROC.

Result: The EnumMacros are both of the type PFNGLOBJECTLABELPROC.