revert apm.completion.bash (requested by @nwinkler https://github.com/Bash-it/bash-it/pull/1782#discussion_r555183474)

completion/available/apm.completion.bash

@@ -24,9 +24,7 @@
 
 # repo: https://github.com/vigo/apm-bash-completion
 
-if _command_exists apm
-then
-    function __apm(){
+__apm(){
     local cur prev options apm_command
     COMPREPLY=()
     cur="${COMP_WORDS[COMP_CWORD]}"
@@ -53,8 +51,7 @@ then
     fi
     COMPREPLY=($(compgen -W "$options" -- "$cur"))
 }
-
-    function __apm_get_command() {
+__apm_get_command() {
     local i
     for ((i=1; i < $COMP_CWORD; ++i)); do
         local arg=${COMP_WORDS[$i]}
@@ -77,6 +74,4 @@ then
         esac
     done
 }
-
 complete -F __apm -o bashdefault -o default apm
-fi