Fix typo in Windows nightly build scripts (#2071)

Author: peterjc123

packaging/windows/internal/build_wheels.bat

@@ -5,7 +5,7 @@ if errorlevel 1 exit /b 1
 call packaging/windows/internal/cuda_install.bat
 if errorlevel 1 exit /b 1
 
-call packaging/windows/internal/nightly_defaults.bat Conda
+call packaging/windows/internal/nightly_defaults.bat Wheels
 if errorlevel 1 exit /b 1
 
 call packaging/windows/build_vision.bat %CUDA_VERSION% %TORCHVISION_BUILD_VERSION% %TORCHVISION_BUILD_NUMBER%