Improved several maps, improved arcade mode

This small update makes arcade mode more fun to play and fixes a broken HUD element during arcade.

- Put the firinghouse closer to the goals on FractalRivers map

- Fixed the average score multiplier display on the HUD so it works during arcade mode

- Covered the 10xs on a couple Plinko maps so they're not disproportionately easy during arcade mode

- Updated SummerMountain and MountainRange to have 1 minute in arcade instead of 2

- Fixed tip text so it doens't appear during arcade mode