Fix: Vulkan: Workbench rendertest were not reported

The Vulkan workbench rendertests were not included to the overall
report due to a typo.

tests/python/CMakeLists.txt

@@ -863,7 +863,7 @@ if((WITH_CYCLES OR WITH_GPU_RENDER_TESTS) AND TEST_SRC_DIR_EXISTS)
           workbench_vulkan_${render_test}
           ${CMAKE_CURRENT_LIST_DIR}/workbench_render_tests.py
           --testdir "${TEST_SRC_DIR}/render/${render_test}"
-          --outdir "${TEST_OUT_DIR}/workbench/vulkan"
+          --outdir "${TEST_OUT_DIR}/workbench_vulkan"
           --gpu-backend vulkan
           ${_gpu_render_tests_arguments}
         )