golint fix (#13613)

imports/placeholder.go

@@ -3,9 +3,10 @@
 
 package imports
 
-// This is a placeholder so this package can be imported in Team Edition when it will be otherwise empty
-
 import (
+	// This is a placeholder so this package can be imported in Team Edition when it will be otherwise empty.
 	_ "github.com/mattermost/mattermost-server/v5/migrations"
+
+	// This is a placeholder so this package can be imported in Team Edition when it will be otherwise empty.
 	_ "github.com/mattermost/mattermost-server/v5/plugin/scheduler"
 )