ci: exclude TestValuePassFloatingPoint2 from wasm builds

vtkValuePass uses a glReadPixels format not supported by GLES 3.0, so
retrieving the floating point values does not work. Exclude this test
like its counterpart TestValuePassFloatingPoint.

.gitlab/ci/ctest_exclusions.cmake

@@ -591,6 +591,7 @@ if ("$ENV{CMAKE_CONFIGURATION}" MATCHES "^wasm(32|64)")
     "^VTK::RenderingOpenGL2Cxx-TestTexture16Bits$"
     "^VTK::RenderingOpenGL2Cxx-TestTextureBufferEmulation$"
     "^VTK::RenderingOpenGL2Cxx-TestValuePassFloatingPoint$"
+    "^VTK::RenderingOpenGL2Cxx-TestValuePassFloatingPoint2$"
     "^VTK::RenderingOpenGL2Cxx-TestVBOPLYMapper$"
     "^VTK::RenderingOpenGL2Cxx-TestWindowBlits$")
 endif ()