Revert "Settings(wifi): Allow mainline wifi stack to use network request dialog"

This reverts commit 6faf8649c7a659bc610349b6b2e156497002c3fb.

Reason for revert: Wifi services no longer plan to be a separate
APK/process for mainline. Will instead become a jar loaded from Apex.

Bug: 144722612
Change-Id: I1d29859866cec3af419fea4f0838d868d2fad8e5
Test: Device boots up & connects to wifi networks.
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index be3983c..3101e9a 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -2731,7 +2731,7 @@
             android:launchMode="singleTop"
             android:taskAffinity=".wifi.NetworkRequestDialogActivity"
             android:exported="true"
-            android:permission="android.permission.MAINLINE_WIFI_STACK">
+            android:permission="android.permission.NETWORK_SETTINGS">
             <intent-filter>
                 <action android:name="com.android.settings.wifi.action.NETWORK_REQUEST" />
                 <category android:name="android.intent.category.DEFAULT" />