Fix opencor e2e test

[odeimaiz]

What do these changes do?

The issue was not the opencor test itself, but this test is the first one that has to click on a NodesTree item. The problem is that some context checks are done when clicking an item and since the export button does not exist for GUEST users, the enable/disable operation on the button fails, not letting the item-clicking-routine go through.

[codecov]

Codecov Report

Merging #1503 into master will increase coverage by 2.63%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1503      +/-   ##
==========================================
+ Coverage   71.28%   73.91%   +2.63%     
==========================================
  Files         247      107     -140     
  Lines        9969     4523    -5446     
  Branches     1096      468     -628     
==========================================
- Hits         7106     3343    -3763     
+ Misses       2550     1072    -1478     
+ Partials      313      108     -205     

Flag	Coverage Δ
#integrationtests	?
#unittests	73.91% <ø> (+10.56%)	⬆️

Impacted Files	Coverage Δ
...simcore_service_webserver/computation_subscribe.py	33.33% <0.00%> (-63.77%)	⬇️
.../simcore_service_webserver/computation_handlers.py	40.00% <0.00%> (-48.00%)	⬇️
...r/src/simcore_service_webserver/computation_api.py	18.98% <0.00%> (-46.21%)	⬇️
...webserver/computation_comp_tasks_listening_task.py	30.15% <0.00%> (-41.27%)	⬇️
...simcore_service_webserver/director/director_api.py	25.00% <0.00%> (-26.67%)	⬇️
...erver/src/simcore_service_webserver/computation.py	63.63% <0.00%> (-22.73%)	⬇️
...rc/simcore_service_webserver/computation_models.py	55.55% <0.00%> (-22.23%)	⬇️
..._service_webserver/projects/projects_exceptions.py	54.54% <0.00%> (-18.19%)	⬇️
...r/src/simcore_service_webserver/director/config.py	86.66% <0.00%> (-13.34%)	⬇️
...simcore_service_webserver/projects/projects_api.py	74.33% <0.00%> (-7.08%)	⬇️
... and 141 more

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