[res] Start using ftl::SmallVector<> where it's most useful

Test: build + boot
Flag: EXEMPT minor change
Change-Id: I21694756674169388407e2b3c7dce850ff19e354
diff --git a/libs/androidfw/tests/Theme_test.cpp b/libs/androidfw/tests/Theme_test.cpp
index 181d141..afcb0c1 100644
--- a/libs/androidfw/tests/Theme_test.cpp
+++ b/libs/androidfw/tests/Theme_test.cpp
@@ -260,7 +260,7 @@
   ResTable_config night{};
   night.uiMode = ResTable_config::UI_MODE_NIGHT_YES;
   night.version = 8u;
-  am_night.SetConfigurations({night});
+  am_night.SetConfigurations({{night}});
 
   auto theme = am.NewTheme();
   {