Update robo properties config (1/2)

 - Update manifest parm to target project

Test: tapas RunThemePickerRoboTests; m -j40
Change-Id: I8d021c2e3d4abd04d3d68768e2deb8d5bb59f911
diff --git a/robolectric_tests/config/robolectric.properties b/robolectric_tests/config/robolectric.properties
index 197c393..6a5d031 100644
--- a/robolectric_tests/config/robolectric.properties
+++ b/robolectric_tests/config/robolectric.properties
@@ -1,2 +1,2 @@
-manifest=vendor/unbundled_google/packages/WallpaperPickerGoogle/AndroidManifest.xml
+manifest=packages/apps/ThemePicker/AndroidManifest.xml
 sdk=27