pw_kvs: Change GC on write configuration default to be one sector

Change the KVS configuration for garbage collect on write from as many sectors as
needed to one sector max.

Change-Id: I0991368753aff5e8de17bb18b43e2e45174ae4c8
diff --git a/pw_kvs/public/pw_kvs/key_value_store.h b/pw_kvs/public/pw_kvs/key_value_store.h
index 8276c20..5122140 100644
--- a/pw_kvs/public/pw_kvs/key_value_store.h
+++ b/pw_kvs/public/pw_kvs/key_value_store.h
@@ -60,8 +60,7 @@
   // garbage collection is attempted if space for an entry cannot be found. This
   // is a relatively lengthy operation. If kDisabled, Put calls that would
   // require garbage collection fail with RESOURCE_EXHAUSTED.
-  GargbageCollectOnWrite gc_on_write =
-      GargbageCollectOnWrite::kAsManySectorsNeeded;
+  GargbageCollectOnWrite gc_on_write = GargbageCollectOnWrite::kOneSector;
 
   // When the KVS handles errors that are discovered, such as corrupt entries,
   // not enough redundant copys of an entry, etc.