Revert "Fixed negative drop points"

This commit didn't actually fix the issue.
This reverts commit 33f2a96ae8.

tetris/modes/gamemode.lua

@@ -69,7 +69,6 @@ function GameMode:new(secret_inputs)
 	self.used_randomizer = nil
 	self.hold_queue = nil
 	self.held = false
-	self.bgm_progression = 0
 	self.section_start_time = 0
 	self.section_times = { [0] = 0 }
 	self.secondary_section_times = { [0] = 0 }
@@ -219,7 +218,7 @@ function GameMode:update(inputs, ruleset)
 		if inputs["up"] == true and
 			self.piece:isDropBlocked(self.grid) and
 			not self.hard_drop_locked then
-			self:onHardDrop(math.max(0, piece_dy))
+			self:onHardDrop(piece_dy)
 			if self.lock_on_hard_drop then
 				self.piece_hard_dropped = true
 				self.piece.locked = true
@@ -227,7 +226,7 @@ function GameMode:update(inputs, ruleset)
 		end
 
 		if inputs["down"] == true then
-			self:onSoftDrop(math.max(0, piece_dy))
+			self:onSoftDrop(piece_dy)
 			if self.piece:isDropBlocked(self.grid) and
 				not self.drop_locked and
 				self.lock_on_soft_drop
@@ -288,10 +287,6 @@ function GameMode:update(inputs, ruleset)
 			end
 		end
 	end
-
-	-- end-of-frame actions, including music swap
-	self:swapMusic(self.level)
-
 	self.prev_inputs = inputs
 end
 
@@ -322,8 +317,6 @@ function GameMode:afterLineClear(cleared_row_count) end
 function GameMode:onPieceEnter() end
 function GameMode:onHold() end
 
-function GameMode:swapMusic(level) end
-
 function GameMode:onSoftDrop(dropped_row_count)
 	self.drop_bonus = self.drop_bonus + 1 * dropped_row_count
 end