[Android] Fix basic-example `hermesc` path (#4371)

## Description

I've noticed that release builds of basic example fail on android due to
the wrong path of hermesc set.

`hermesc` path is resolved with the working dir set to the app directory
and React Native will automatically select the right [OS-specific
path](https://github.com/react/react-native/blob/63e9c1544834a43b1b44af4033184b1eab6f2ffa/packages/gradle-plugin/react-native-gradle-plugin/src/main/kotlin/com/facebook/react/utils/PathUtils.kt#L137-L139).

## Test plan

Build the app in release mode or run `./gradlew
:app:createBundleReleaseJsAndAssets` before & after this change.