Fix formatting of gb plugin completion

plugins/getgb/getgb.plugin.zsh

@@ -1,10 +1,9 @@
-function _gb_commands() {
+_gb () {
 	local ret=1 state
 	_arguments -C ':command:->command' '*::options:->options' && ret=0
 
 	case $state in
 	(command)
-
 		local -a subcommands
 		subcommands=(
 			"build:build a package"
@@ -19,7 +18,6 @@ function _gb_commands() {
 		)
 		_describe -t subcommands 'gb subcommands' subcommands && ret=0
 		;;
-
 	(options)
 		case $line[1] in
 		(build)
@@ -50,7 +48,7 @@ function _gb_commands() {
 				-tags'["tag list" additional build tags]'
 			;;
 		(vendor)
-            __gb-vendor
+			_gb-vendor
 		esac
 		;;
 	esac
@@ -58,17 +56,14 @@ function _gb_commands() {
 	return ret
 }
 
-compdef _gb_commands gb
+compdef _gb gb
 
-__gb-vendor ()
-{
+_gb-vendor () {
 	local curcontext="$curcontext" state line
-
 	_arguments -C ':command:->command' '*::options:->options'
 
 	case $state in
 	(command)
-
 		local -a subcommands
 		subcommands=(
 			'delete:deletes a local dependency'
@@ -80,7 +75,6 @@ __gb-vendor ()
 		)
 		_describe -t subcommands 'gb vendor subcommands' subcommands && ret=0
 		;;
-
 	(options)
 		case $line[1] in
 			(delete)