fix `access-mapping.yml` extra_facets title

[rhaegar325]

Description

make a slight change in title of access-mapping.yml to avoid a potential bug

Closes #2483

Link to documentation:

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[rbeucher]

Thanks @rhaegar325. Why this was not picked by the tests?

[rbeucher]

Tests are failing. @rhaegar325 please have a loop as soon as possible.

[rbeucher]

Also. Can you explain the bug in more details, please? for the records

[rbeucher]

@rhaegar325 We usually use dataset: ACCESS-ESM1-5 not ACCESS_ESM1_5

[rhaegar325]

@rbeucher, now this error has been fixed. The bug is caused by we deside to change the file name of our cmoriser from access_esm.py to access_esm1_5.py. but I did not change the title in extra_facets access-mapping.yml, so when we use the cmoriser it can not load the extra_facets. Also, in test_access_esm1_5.py, I did not change the dataset name to ACCESS-ESM1-5, so the test didn't pick this error up. silly mistake, won't happen again.