Linux AppImage: Fix Dockerfile
Linux AppImage: Fix Dockerfile

libssl1-dev and libssl1.1 packages are now versioned as:

"1.1.0g-2ubuntu4" rather than "1.1.0g-2ubuntu4.3"

This broke the Docker AppImage build. This commit fixes it.

fyookball/electrum,fyookball/electrum,fyookball/electrum