Recover tags when closing dialog via backdrop click

Also stop using reference of local room variable tags so that they will be not overriden after closing dialog with 'abort'-action.
3 jobs for fix-tag-deletion in 12 minutes and 47 seconds (queued for 1 second)
Status Job ID Name Coverage
  Codestyle
passed #238923
nodejs
tslint

00:02:21

 
  Test
passed #238924
nodejs
unit_tests

00:02:19

 
  Build
passed #238925
angular
ngbuild

00:08:06