Fix: Storm render tests fail to run

An oversight in b7028617ad lead to Storm
render tests failing due to a missing argument.

This commit fixes that.

Pull Request: https://projects.blender.org/blender/blender/pulls/131740

tests/python/CMakeLists.txt

@@ -846,7 +846,7 @@ if(WITH_CYCLES OR WITH_GPU_RENDER_TESTS)
             ${CMAKE_CURRENT_LIST_DIR}/storm_render_tests.py
             --testdir "${TEST_SRC_DIR}/render/${render_test}"
             --outdir "${TEST_OUT_DIR}/storm_hydra"
-            -export_method "HYDRA"
+            --export_method "HYDRA"
             ${_gpu_render_tests_arguments}
           )
         endforeach()
@@ -857,7 +857,7 @@ if(WITH_CYCLES OR WITH_GPU_RENDER_TESTS)
             ${CMAKE_CURRENT_LIST_DIR}/storm_render_tests.py
             --testdir "${TEST_SRC_DIR}/render/${render_test}"
             --outdir "${TEST_OUT_DIR}/storm_usd"
-            -export_method "USD"
+            --export_method "USD"
             ${_gpu_render_tests_arguments}
           )
         endforeach()