[localization] Remove unused Bundle.toShallowMap (expo#46998)

# Why
This PR is part of a series aimed at removing compilation warnings.

It removes the following warning:
```gradle
packages/expo-localization/android/src/main/java/expo/modules/localization/LocalizationModule.kt:176:16 - 'fun get(p0: String!): Any?' is deprecated. Deprecated in Java.
```
# How

Removes unused `Bundle.toShallowMap`, which uses the deprecated `get`
function

# Test Plan
BareExpo ✅

Author: Wenszel

packages/expo-localization/android/src/main/java/expo/modules/localization/LocalizationModule.kt

@@ -5,7 +5,6 @@ import android.icu.util.LocaleData
 import android.icu.util.ULocale
 import android.os.Build.VERSION
 import android.os.Build.VERSION_CODES
-import android.os.Bundle
 import android.text.TextUtils.getLayoutDirectionFromLocale
 import android.text.format.DateFormat
 import android.util.LayoutDirection
@@ -166,14 +165,3 @@ class LocalizationModule : Module() {
     )
   }
 }
-
-/**
- * Creates a shallow [Map] from the [Bundle]. Does not traverse nested arrays and bundles.
- */
-private fun Bundle.toShallowMap(): Map<String, Any?> {
-  val map = HashMap<String, Any?>()
-  for (key in this.keySet()) {
-    map[key] = this[key]
-  }
-  return map
-}