Tests/Contracts: Update VTK release branch build configuration

Configure our contract test to work with the VTK 9.0 branch.

Tests/Contracts/VTK/Dashboard.cmake.in

@@ -24,8 +24,8 @@ set(CTEST_BUILD_COMMAND "@CMAKE_MAKE_PROGRAM@ -j9 -i")
 ctest_empty_binary_directory(${CTEST_BINARY_DIRECTORY})
 
 file(WRITE "${CTEST_BINARY_DIRECTORY}/CMakeCache.txt" "
-  BUILD_EXAMPLES:BOOL=ON
-  BUILD_TESTING:BOOL=ON
+  VTK_BUILD_EXAMPLES:BOOL=ON
+  VTK_BUILD_TESTING:STRING=WANT
   VTK_WRAP_PYTHON:BOOL=ON
   ExternalData_OBJECT_STORES:FILEPATH=@base_dir@/ExternalData
 ")