MiSTer Companion v4.5.1

This is a small bugfix and polish update.

Changes

• Fixed a Connection tab issue where selecting a scanned MiSTer IP while a profile was selected could leave the Connect & Save and Save Only buttons disabled.
• Improved the RetroAchievement Cores update check output in the Extras tab.
• The app now shows which RetroAchievement core/source is being checked instead of only showing one generic update-check message.