Ui: Fix regression in event modal view
Ui: Fix regression in event modal view

A className conflict introduces a regression in the modal view. This
commit scope css rules more specificaly to fix the conflict.

cozy-labs/calendar,aenario/cozy-agenda,clochix/cozy-calendar,nono/cozy-calendar,Noctisae/cozy-series,nono/cozy-calendar,lemelon/cozy-calendar,kelukelu/cozy-calendar,frankrousseau/cozy-calendar,cozy/cozy-calendar,jsilvestre/cozy-calendar,jsilvestre/cozy-calendar,kelukelu/cozy-calendar,Noctisae/cozy-series,poupotte/cozy-calendar,cozy/cozy-calendar,lemelon/cozy-calendar,frankrousseau/cozy-calendar,aenario/cozy-agenda,poupotte/cozy-calendar,cozy-labs/calendar