Bugfixes & Stability Improvements

Fixes

• URLs beginning with "www." are now automatically prefixed with "https://", resolving associated bugs.
• Fixed crash occurring during tag assignment via metadata import.
• Fixed Homebrewery Cover Art fetching, which was broken by recent website changes.
• Errors during filtering will no longer result in a crash.
• Fix the "Delete Collection" button not working.
• Fixed folder import dialog displaying despite cancelled selection.