Makes proper Soong targets for test modules

Bug: 331594637
Flag: NA
Test: tests compile
Change-Id: I523076cfdf7750ab5497c378fac8633acfa30b17
diff --git a/tests/module/Android.bp b/tests/module/Android.bp
index c174699..29d4965 100644
--- a/tests/module/Android.bp
+++ b/tests/module/Android.bp
@@ -19,6 +19,7 @@
 
 android_library {
     name: "ThemePickerTestModule",
+    defaults: ["ThemePicker_defaults_with_overrides"],
     srcs: ["src/com/android/customization/TestModule.kt"],
     static_libs: [
         "ThemePickerTestLib",