Make RNTester build and pass again (#22468)

Summary:
Detox was failing because of build errors due to the new xcode10 build system. These errors were fixed by RSNara in b7349f9 but this callsite was missed.
Pull Request resolved: #22468

Reviewed By: RSNara

Differential Revision: D13287386

Pulled By: TheSavior

fbshipit-source-id: 8a2df9801c69d851eabe7074ffc12b29c03a636a

RNTester/e2e/config.json

@@ -1,5 +1,5 @@
 {
-  "setupTestFrameworkScriptFile" : "./__tests__/init.js",
+  "setupTestFrameworkScriptFile" : "./test-init.js",
   "testEnvironment": "node",
   "bail": true,
   "verbose": true

RNTester/e2e/__tests__/init.js → RNTester/e2e/test-init.js

@@ -8,7 +8,7 @@
 /* eslint-env jasmine */
 
 const detox = require('detox');
-const config = require('../../../package.json').detox;
+const config = require('../../package.json').detox;
 const adapter = require('detox/runners/jest/adapter');
 
 jest.setTimeout(480000);

package.json

@@ -237,7 +237,7 @@
     "configurations": {
       "ios.sim.release": {
         "binaryPath": "RNTester/build/Build/Products/Release-iphonesimulator/RNTester.app/",
-        "build": "xcodebuild -project RNTester/RNTester.xcodeproj -scheme RNTester -configuration Release -sdk iphonesimulator -derivedDataPath RNTester/build -quiet",
+        "build": "xcodebuild -project RNTester/RNTester.xcodeproj -scheme RNTester -configuration Release -sdk iphonesimulator -derivedDataPath RNTester/build -UseModernBuildSystem=NO -quiet",
         "type": "ios.simulator",
         "name": "iPhone 8"
       }