[Quick Fix] Made keypress timing more lenient

Starmapper takes the left and right keys as inputs, and as one of its main mechanics, it must be able to register when the player presses left and right simultaneously (used to shuffle the board and/or clear a star icon). To check for this, the previously uploaded version of Starmapper used a time window of 30 ms.

Upon further playtesting, however, this short time window was determined to be too inconvenient/inaccurate, so the game has received a quick update in which a time window of 50 ms is implemented instead. This should allow players to more easily clear star icons and shuffle the board.