LP#1929596: Adds help popover text next to 'Convert change to patron

LP#1929596: Adds help popover text next to 'Convert change to patron
credit'

Search for a patron
Go to Bills
Note the popover text next to 'Convert change to patron credit' modifier

Release-note: Adds help button for 'Convert change to patron credit' on patron bills

Signed-off-by: Gina Monti <gmonti@biblio.org>
Signed-off-by: Terran McCanna <tmccanna@georgialibraries.org>
<eg-help-popover help-text="[% l('Applies any remaining amount after payment to the patron account for future use.') %]">#

Signed-off-by: Jane Sandberg <js7389@princeton.edu>