Fixed flaky test(s) - (SOL-336)

common/test/acceptance/pages/studio/overview.py

...on/test/acceptance/performance/test_studio_performance.py

common/test/acceptance/tests/lms/test_library.py

...n/test/acceptance/tests/lms/test_lms_courseware_search.py

common/test/acceptance/tests/studio/base_studio_test.py

...n/test/acceptance/tests/studio/test_studio_acid_xblock.py

common/test/acceptance/tests/studio/test_studio_general.py

.../acceptance/tests/studio/test_studio_library_container.py

common/test/acceptance/tests/studio/test_studio_outline.py

common/test/acceptance/tests/studio/test_studio_rerun.py

...acceptance/tests/studio/test_studio_with_ora_component.py

...n/test/acceptance/tests/video/test_studio_video_module.py