Remove Truffle patches

[cgewecke]

These were added to the plugin to support truffle users who were not on the latest Truffle version required to support some logic here. (Long ago)

#692

It's really the end of the road for truffle here - the plugin can no longer access ganache internals the way it needs to with ganache v7. Errors with:

UnhandledRejections detected
Promise {
  <rejected> TypeError: Cannot read private member from an object whose class did not declare it
      at __classPrivateFieldGet (/home/circleci/project/metacoin/node_modules/ganache/dist/node/webpack:/Ganache/core/lib/src/server.js:10:94)
      at close (/home/circleci/project/metacoin/node_modules/ganache/dist/node/webpack:/Ganache/core/lib/src/server.js:221:13)
      at /home/circleci/project/metacoin/node_modules/solidity-coverage/node_modules/pify/index.js:32:6