net-im/telegram-desktop: update to 5.15.3 release (+)
Upstream renamed the binary from telegram-desktop to Telegram.
Changelog: https://github.com/telegramdesktop/tdesktop/releases/tag/v5.15.0 \
https://github.com/telegramdesktop/tdesktop/releases/tag/v5.15.1 \ https://github.com/telegramdesktop/tdesktop/releases/tag/v5.15.2 \ https://github.com/telegramdesktop/tdesktop/releases/tag/v5.15.3