remove useless --ignore for macos

.gitlab-ci.yml

@@ -123,7 +123,7 @@ windows_test_python39:
     - pip install pyqt5==5.13.2
     - pip install --pre --find-links artifacts/ --only-binary silx silx[full,test]
     # Do not run GUI tests and OpenCL ones
-    - python -c "import silx.test, sys; sys.exit(silx.test.run_tests(args=['--ignore=silx/opencl']));"
+    - python -c "import silx.test, sys; sys.exit(silx.test.run_tests());"
 
 
 macos_test_python36: