Fixed several bugs
- Bug: Can start migration with same version after removing and adding it manually.
- Bug: Manually added versions have incorrect mods path (only affects version comparison).
- Bug: Versions list labels overlaps first items in migration tool.
- Bug: Selecting previous version in versions panel cause crash when version doesn't deleted by
- Bug: Migration tool can pick same version when migrating between versions with same version number.
- Bug: Possibility to add version without