[FE] Always enable "Edit" button for snippets
At the time of writing the "Edit" button for a Snippet is disabled in case of at least one blob in that snippet is binary.
After #225881 is implemented, we should be safe with enabling the Edit button for snippets at all times.
Why?
Because snippets are more than just the blobs and users still should be able to update Title, Description. Visibility of each particular snippet.
Edited by Francisco Javier López (ex-Gitlab)