Fix dropdown menu
Fix dropdown menu

Commit 79568dcf3f981b144940a400ee3c4e2bbdc1026a set header zindex
to 1 from 100 - this sets it back to 100.

selahssea/ggrc-core,VinnieJohns/ggrc-core,VinnieJohns/ggrc-core,plamut/ggrc-core,plamut/ggrc-core,AleksNeStu/ggrc-core,VinnieJohns/ggrc-core,selahssea/ggrc-core,AleksNeStu/ggrc-core,plamut/ggrc-core,AleksNeStu/ggrc-core,AleksNeStu/ggrc-core,plamut/ggrc-core,VinnieJohns/ggrc-core,selahssea/ggrc-core,selahssea/ggrc-core