Launcher3: use OmniPreferenceTheme

Change-Id: Ifcd0cda135e3bc7fabd1be03e2358f99709febf6
diff --git a/Android.bp b/Android.bp
index 13a926b..c661986 100644
--- a/Android.bp
+++ b/Android.bp
@@ -165,6 +165,7 @@
         "com_android_wm_shell_flags_lib",
         "android.appwidget.flags-aconfig-java",
         "com.android.window.flags.window-aconfig-java",
+        "OmniPreferenceTheme",
     ],
     manifest: "AndroidManifest-common.xml",
     sdk_version: "current",