Replaced spaces with tabs.

Check CONTRIBUTING.md, guys!

tetris/rulesets/cambridge.lua

@@ -363,10 +363,10 @@ function CRS:attemptRotate(new_inputs, piece, grid, initial)
 	end
 
 	if rot_dir == 0 then return end
-    
-    if self.world and config.gamesettings.world_reverse == 2 then
-        rot_dir = 4 - rot_dir
-    end
+	
+	if self.world and config.gamesettings.world_reverse == 2 then
+		rot_dir = 4 - rot_dir
+	end
 
 	local new_piece = piece:withRelativeRotation(rot_dir)
 	self:attemptWallkicks(piece, new_piece, rot_dir, grid)