Bug fixes: win/loss record and confirmation email in dark mode

Bug fixes.

• Wins and losses not updating. When a game ended, the game told your client to refresh your record and match history before the server had finished saving the result, so you often saw the old numbers. The server now saves the result first and only then announces that the game is over. A failure saving the game itself also no longer prevents your win or loss from being counted.
• Confirmation and password-reset emails in dark mode. These emails forced a dark text color, which made them hard or impossible to read in mail apps that use a dark background. They no longer set a body text color, so your mail app picks one that fits.