fix(terraform): go back to zsh custom completion

Revert fcbfdf42de

plugins/terraform/terraform.plugin.zsh

@@ -16,8 +16,3 @@ alias tfi='terraform init'
 alias tfo='terraform output'
 alias tfp='terraform plan'
 alias tfv='terraform validate'
-
-if (( $+commands[terraform] )); then
-  autoload -U +X bashcompinit && bashcompinit
-  complete -o nospace -C terraform terraform
-fi