Bug 11381: improve styling of IDreamBooks content in bootstrap theme

Styling of IDreamBooks elements is not correct in the bootstrap theme
because the relevant CSS was not transferred from the prog theme. This
patch adds it back.

To test, switch to the bootstrap theme and enable IDreamBooks system
preferences in the OPAC, particularly IDreamBooksReadometer. Find a book
in the OPAC which shows IDreamBooks review data and confirm that
everything looks correct.

Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Works as described. Tested with "The help".

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
(cherry picked from commit f2c61429944140abfd0a097bdb50b03e08ef569b)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>