don't load password when autocompleting CLI commands

changelog/unreleased/issue-4516

@@ -0,0 +1,8 @@
+Bugfix: Do not try to load password on command line autocomplete
+
+The command line autocompletion previously tried to load the repository
+password. This could cause the autocompletion not to work. Now, this step gets
+skipped.
+
+https://github.com/restic/restic/issues/4516
+https://github.com/restic/restic/pull/4526

cmd/restic/main.go

@@ -80,7 +80,7 @@ The full documentation can be found at https://restic.readthedocs.io/ .
 // user for authentication).
 func needsPassword(cmd string) bool {
 	switch cmd {
-	case "cache", "generate", "help", "options", "self-update", "version":
+	case "cache", "generate", "help", "options", "self-update", "version", "__complete":
 		return false
 	default:
 		return true