Minor graphical updates and code cleaning.

- Padded game score display, and always display 2 digits in front of the decimal (e.g. 00.00% instead of 0.00%).
- Keep map progress circle at a fixed location instead of basing it off the score length.
- Moved some track resets (pause + restart at preview) to trigger upon loading the song menu.  Fixes weird behaviors when leaving the game state.
- Cleaned up trailing whitespace and added missing overrides.

Signed-off-by: Jeffrey Han <itdelatrisu@gmail.com>

src/itdelatrisu/opsu/GameMod.java

@@ -129,7 +129,7 @@ public enum GameMod {
 			Image img = new Image(filename);
 			float scale = (height * 0.12f) / img.getHeight();
 			img = img.getScaledCopy(scale);
-	
+
 			// find coordinates
 			float offsetX = img.getWidth() * 1.5f;
 			float x = (width / 2f) - (offsetX * SIZE / 2.75f);