cmake: remove trailing whitespace

CMake/vtkInstallCMakePackage.cmake

CMake/vtkModule.cmake

CMake/vtkModuleSerialization.cmake

CMake/vtkOpenGLOptions.cmake

CMake/vtkTypeLists.cmake

Common/DataModel/CMakeLists.txt

Common/ExecutionModel/CMakeLists.txt

IO/CatalystConduit/CMakeLists.txt

IO/Import/Testing/Cxx/CMakeLists.txt

Rendering/Core/CMakeLists.txt

Rendering/WebGPU/Testing/Cxx/CMakeLists.txt

Serialization/Manager/CMakeLists.txt

Testing/ExternalWasm/CMakeLists.txt

Wrapping/Tools/CMakeLists.txt