Remove delayed attr in all sources.
* helm-bookmark.el (helm-source-bookmarks): Do it.
* helm-files.el (helm-source-tracker-search,
helm-source-findutils,
helm-source-mac-spotlight):Do it.
* helm-grep.el (helm-do-grep-1, helm-do-grep-1): Do it.
* helm-locate.el (helm-source-locate, helm-locate-read-file-name): Do it.
* helm-regexp.el (helm-source-moccur, helm-source-regexp): Do it.