Change: Rollback the algorithm about deltaTime

use `me.price / me.newCookiesPs` (time to catch up spent cookies) seems better than  `me.price / deltaCps` (time to catch up cookies of not buying the deal)

Author: jcppkkk

CHANGELOG.md

@@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 # Changed
 - Change: Ignore tech type upgrades
+- Change: Rollback the algorithm about deltaTime
 
 ## [2042.11] - 2021-09-19
 ### Added