Hotfix, latency mitigation

• reinstated the hotfix removed into version 1.9.0, forcing IP connection when using FQDN; fact is, some people still have issues even with openssl 1.1.x (unable to reproduce, may depend on a specific configuration). more details here: FreeRDP/FreeRDP#4525 (comment)
• improved performance mitigation in case of high latency network
• the installer no longer requires administrator rights by default (but may still needs elevation during the installation, depending on the installed component(s))