Bug 20362: Direct link to authority records missing in staff detail view (1xx , 7xx)

Bug 20362: Direct link to authority records missing in staff detail view (1xx , 7xx)

I added a magnigying glass icon in the staff detail view for 1xx and 7xx
of the record that links to the authority records.

The following test plan is for 100 tag only but the patch can be apply
for all 1xx and 7xx tags that can be connect with an authority record.

Test Plan:
1) On the Koha staff page, create a new authority. The type of authority
   will be: e.g Personal Name
2) When creating authority, in tab 1 under -HEADING--PERSONAL NAME enter
   the personal name term entry element and then save the
   new authority e.g. Twain, Mark.
3) In circulation, search the catalog for a random book. Click the title
   of the book and you will be taken to the book details.
4) Edit the record and in tab 1 , scroll down the - MAIN ENTRY--
   PERSONAL NAME and repeat this tag (the icon next to the title).
5) Edit the Personal name term entry element by clicking
   the button on the right of the bar.
6) In the Search main heading ($a only) enter your personal name term
   e.g. Twain, Mark.
7) Press search, and then in the table that pops up, click 'choose'.
8) Save your edits and the new personal name term will be in the 'By:'
   of the book details.
9) Notice that there is no magnifying glass icon.
10) Apply this patch
11) Notice that there is now a magnifying glass icon next to the
    personal name term.
12) Click on the magnifying glass and it will take you directly to the
    authorities records

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>