chore(settings): use qdm12/gosettings functions

- use: FileExists, ObfuscateKey, BoolToYesNo
- remove local functions moved to gosettings

internal/configuration/settings/helpers/string.go

@@ -1,12 +1,5 @@
 package helpers
 
-func BoolPtrToYesNo(b *bool) string {
-	if *b {
-		return "yes"
-	}
-	return "no"
-}
-
 func TCPPtrToString(tcp *bool) string {
 	if *tcp {
 		return "TCP"