Remove unused jdenticon js library
    
    This library was first introduced in
    e914eff4358b82780e5cbec987c71860878be1a6
    then the code that used it was remove in
    49bf7f18833c3d7f974403abdc65578fd90631de
    
    Signed-off-by: Shengjing Zhu <zsj950618@gmail.com></zsj950618@gmail.com>
    
    Merges https://pagure.io/pagure/pull-request/2310