Simplify ThemePicker dependencies

Replace ThemePicker_common_defaults, ThemePicker_srcs and
ThemePicker_res with a single ThemePickerLib android_library.
This will compile ThemePicker_srcs and ThemePicker_res a single
time instead of in every module.

Also replace the ThemePicker_src_overrides with a ThemePickerOverridesLib
java_library.

Bug: 319160342
Test: builds
Test: atest --host ThemePickerRoboTests
Flag: NA
Change-Id: Ia55daf02a86c331d77d33187b1173e13422f3fc1
diff --git a/tests/common/Android.bp b/tests/common/Android.bp
index 9215ba6..06c3834 100644
--- a/tests/common/Android.bp
+++ b/tests/common/Android.bp
@@ -23,12 +23,12 @@
 android_library {
     name: "ThemePickerTestLib",
 
-    defaults: ["ThemePicker_common_defaults"],
     srcs: [
         "src/**/*.java",
         "src/**/*.kt",
     ],
     static_libs: [
+        "ThemePickerLib",
         "WallpaperPicker2TestLib",
         "androidx.annotation_annotation",
         "kotlinx_coroutines_test",