Update approval controller test import (#339)

The approval controller tests were importing the _built_ version of the
approval controller, rather than the original source. This resulted in
odd coverage stats, and necessitated ignoring `dist/BaseController*`.

By updating the import to use the source directly, the coverage stats
look fine without ignoring anything.

package.json

@@ -96,7 +96,6 @@
     ],
     "coveragePathIgnorePatterns": [
       "/node_modules/",
-      "dist/BaseController*",
       "tests/"
     ],
     "coverageThreshold": {

tests/ApprovalController.test.js

@@ -1,5 +1,5 @@
 const { errorCodes } = require('eth-rpc-errors');
-const ApprovalController = require('../dist/approval/ApprovalController').default;
+const ApprovalController = require('../src/approval/ApprovalController').default;
 
 const defaultConfig = {
   showApprovalRequest: () => undefined,

tests/ApprovalController.test.ts

@@ -1,5 +1,5 @@
 import { errorCodes } from 'eth-rpc-errors';
-import ApprovalController from '../dist/approval/ApprovalController';
+import ApprovalController from '../src/approval/ApprovalController';
 
 const sinon = require('sinon');