Cannot add/modify study components for replication studies in-context within replication table

[eplebel]

Steps:

1. Go to an article that has at least one linked replication study (e.g., https://curatescience-staging.herokuapp.com/beta#/articles/335236)
2. Click on one of the study components for the replication study (e.g., data & syntax for the LeBel & Pashler (2011) replication study)

Notice the "Add a link" button is missing and hence one cannot add links to data/syntax files for a replication study in that context. The only way would be to browse to original article for that replication study and add links there (https://curatescience-staging.herokuapp.com/beta#/articles/335232) but this is of course highly suboptimal; same thing happens for materials and registration study components.

Notice if you click on study components for the original study, the "Add a link" button is present.

This is likely related to closed issue #126 whereby one couldn't edit study information for replication studies within replication table.

[eplebel]

Because of this issue, I just noticed that for authenticated users, the text "Please log in to add a link" is displayed within all study component cells. I assume once this issue is fixed, that this related issue will no longer be an issue.