Fix the usage of outdated brew cask list

completions/zsh/_brew_cask

@@ -32,7 +32,7 @@ __brew_all_casks() {
 __brew_installed_casks() {
   local -a list
   local expl
-  list=( $(__brew_cask list|sed 's/(!)//') )
+  list=( $(brew list --cask) )
   _wanted list expl 'installed casks' compadd -a list
 }
 
@@ -136,10 +136,6 @@ _brew_cask_list() {
     '*::token:__brew_installed_casks'
 }
 
-_brew_cask_ls() {
-  _brew_cask_list
-}
-
 _brew_cask_outdated() {
   _arguments : \
     '--greedy:also list Casks with auto_updates or version \:latest' \