Update Battery preference for Instant Hotspot

- Use the static battery full icon

- Show charging status in Battery preference summary

Bug: 300559036
Test: manual test
atest -c WifiNetworkDetailsFragmentTest

Merged-In: I89e811ba0d1b715d4fff23c96bc094cd4270fef7
Change-Id: I89e811ba0d1b715d4fff23c96bc094cd4270fef7

res/drawable/ic_battery_full.xml

@@ -0,0 +1,25 @@
+<!--
+    Copyright (C) 2023 The Android Open Source Project
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+         http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="960"
+        android:viewportHeight="960"
+        android:tint="?attr/colorControlNormal">
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M320,880Q303,880 291.5,868.5Q280,857 280,840L280,200Q280,183 291.5,171.5Q303,160 320,160L400,160L400,80L560,80L560,160L640,160Q657,160 668.5,171.5Q680,183 680,200L680,840Q680,857 668.5,868.5Q657,880 640,880L320,880Z"/>
+</vector>