Remove the edit template button from the template provider edit sheet since it does not make much sense

While in inline edit on a template provider document, there is a small piece of javascript code that adds an edit button once you fill in (or if it was already filled in) the template document to use.

However, the view mode for the sheet already has the configured template as a link that a user can easily click on. The edit button in edit mode does not make sense since that value has just been filled in and there is no existence check or anything on the user entered string.

Also, with XWIKI-11482 and its adherence to the vertical form standard, the edit button does not fit in any more and creates an unwanted jitter when it pops up, also making 2 tests fail.

The link in view mode should be more than enough for a user to easily navigate to the configured template document.