Fixed angular webpack config path in postinstall patch script

[mbykovskyy]

What worries me is that Angular Truffle Box, Ethereum Web3.js, and now Taquito all have different path for angular web pack config.

Ethereum Web3.js patch points to '../../node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/webpack-configs/browser.js'

Angular Truffle Box patch points to 'node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/webpack-configs/browser.js'

Taquito patch points to '../../@angular-devkit/build-angular/src/angular-cli-files/models/webpack-configs/browser.js'

This makes me believe that either my local test didn't do what npm install does or NPM has changed the CWD of post install scripts.

[codecov-io]

Codecov Report

Merging #140 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #140   +/-   ##
=======================================
  Coverage   77.69%   77.69%           
=======================================
  Files          59       59           
  Lines        1941     1941           
  Branches      408      408           
=======================================
  Hits         1508     1508           
  Misses        430      430           
  Partials        3        3

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