Fixes and Improvements

• Corrected issue where the board was interactable via the pause menu. Clicks happening while paused are ignored now.
• Revealed cells that don't contain anything (Numbers, Bombs) have a transparent look to them to help with large board confusion.
• Once again tweaked leaderboards to better reflect your current score vs leaderboard scores.
• Ensured leaderboard scores are calculated with live Steam Leaderboard data rather than stale data.
• First play times are no longer counted as "First Leaderboard Upload" which resulted in the first play always appearing as their first time being entered into a leaderboard position.