Fix some new lint issues

ultrasonic/src/main/AndroidManifest.xml

@@ -27,7 +27,8 @@
         android:theme="@style/NoActionBar"
         android:name=".app.UApp"
         android:label="@string/common.appname"
-        android:usesCleartextTraffic="true">
+        android:usesCleartextTraffic="true"
+        tools:ignore="UnusedAttribute">
 
         <meta-data android:name="com.google.android.gms.car.application"
             android:resource="@xml/automotive_app_desc"/>

ultrasonic/src/main/res/xml/appwidget_info_4x1.xml

@@ -1,9 +1,11 @@
 <?xml version="1.0" encoding="utf-8"?>
 <appwidget-provider xmlns:a="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
     a:minWidth="250dp"
     a:minHeight="40dp"
     a:updatePeriodMillis="0"
     a:resizeMode="none"
     a:previewImage="@drawable/preview4x1"
     a:widgetCategory="home_screen|keyguard"
-                    a:initialLayout="@layout/appwidget4x1"/>
+    a:initialLayout="@layout/appwidget4x1"
+    tools:ignore="UnusedAttribute" />

ultrasonic/src/main/res/xml/appwidget_info_4x2.xml

@@ -1,9 +1,11 @@
 <?xml version="1.0" encoding="utf-8"?>
 <appwidget-provider xmlns:a="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
     a:minWidth="250dp"
     a:minHeight="110dp"
     a:updatePeriodMillis="0"
     a:resizeMode="none"
     a:previewImage="@drawable/preview4x2"
     a:widgetCategory="home_screen|keyguard"
-                    a:initialLayout="@layout/appwidget4x2"/>
+    a:initialLayout="@layout/appwidget4x2"
+    tools:ignore="UnusedAttribute" />