ThemePickerLeaf: Remove unnecessary privileges

The "platform" certificate level, and INTERACT_ACROSS_USERS_FULL, were
added in I60b24f0c but are not required.

Change-Id: Idb1907711fb91981ccf0677795f2659d6572d787
diff --git a/Android.bp b/Android.bp
index de35b67..66a1e14 100644
--- a/Android.bp
+++ b/Android.bp
@@ -90,7 +90,7 @@
     kotlincflags: ["-Xjvm-default=enable"],
     use_embedded_native_libs: true,
 
-    certificate: "platform",
+    certificate: "",
     privileged: true,
     system_ext_specific: true,
     platform_apis: true,
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 380b14b..116eac6 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -18,7 +18,6 @@
     package="com.android.wallpaper">
     <uses-permission android:name="android.permission.BIND_WALLPAPER" />
     <uses-permission android:name="android.permission.QUERY_ALL_PACKAGES" />
-    <uses-permission android:name="android.permission.INTERACT_ACROSS_USERS_FULL" />
 
     <queries>
         <!-- Intent filter with action used to discover launcher -->