Fix Xcode version check (#3428)

Summary:
Fixes https://github.com/facebook/flipper/issues/3396 - the Xcode version mismatch check has been broken since 0.132.0.

## Changelog

Fixed Xcode version mismatch check

Pull Request resolved: https://github.com/facebook/flipper/pull/3428

Test Plan: No existing test, manually tested locally on macOS 11.6.3 via `yarn start` when launching the Simulator directly or via `yarn react-native run-ios` in an RN project

Reviewed By: lblasa, mweststrate

Differential Revision: D34139471

Pulled By: lawrencelomax

fbshipit-source-id: 97920de5c463b366ef7ecaef0441ee37debe5d46

desktop/flipper-server-core/src/devices/ios/iOSDeviceManager.tsx

@@ -195,7 +195,7 @@ export class IOSDeviceManager {
       let {stdout: xcodeCLIVersion} = await exec('xcode-select -p');
       xcodeCLIVersion = xcodeCLIVersion!.toString().trim();
       const {stdout} = await exec(
-        "pgrep Simulator | xargs ps | grep Simulator.app | awk '{print $NF}'",
+        "pgrep Simulator | xargs ps -o command | grep -v grep | grep Simulator.app | awk '{print $1}'",
       );
       for (const runningSimulatorApp of stdout!.toString().split('\n')) {
         if (!runningSimulatorApp) {