add CSS for .drag-handle and use it for all handles, fixes #2469

app/views/admin/statusgroups/_members.php

app/views/course/forum/area/add.php

app/views/course/plus/sorttools.php

app/views/course/statusgroups/_group.php

app/views/fachabschluss/faecher/fach.php

app/views/global_search/settings.php

app/views/module/module/modul.php

app/views/module/module/modulteil.php

app/views/questionnaire/edit.php

app/views/resources/search/rooms.php

app/views/shared/form_dokumente.php

app/views/studiengaenge/studiengaenge/studiengang.php

resources/assets/javascripts/bootstrap/dates.js

resources/assets/javascripts/bootstrap/statusgroups.js

resources/assets/javascripts/lib/forum.js

resources/assets/javascripts/lib/statusgroups.js

resources/assets/javascripts/mvv.js

resources/assets/stylesheets/less/tables.less

resources/assets/stylesheets/scss/courseware.scss

resources/assets/stylesheets/scss/dates.scss