Minor update for Vivaldi iOS Browser 6.3 | Vivaldi Browser

This update includes various small fixes.

• App captures incorrect Speed Dial thumbnail (VIB-380)
• Bookmarks and Speed dial URLs are stored lowercased from editor (VIB-240)
• Make sure What’s new page is shown after each update (VIB-356)
• Sync button from Privacy settings shows Chrome Sync UI (VIB-395)
• Vivaldi iOS does not accept backup encryption key file (VIB-410)