DeleteReviewer#updateChange: Use database from context

Change-Id: If0dd9547e8fa40ff965fc4be4db4465d0486bc9a
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/change/DeleteReviewer.java b/gerrit-server/src/main/java/com/google/gerrit/server/change/DeleteReviewer.java
index be5c75d..9584de5 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/change/DeleteReviewer.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/change/DeleteReviewer.java
@@ -136,7 +136,7 @@
         throw new ResourceNotFoundException();
       }
       currChange = ctx.getChange();
-      currPs = psUtil.current(dbProvider.get(), ctx.getNotes());
+      currPs = psUtil.current(ctx.getDb(), ctx.getNotes());
 
       Set<String> placeholders = new HashSet<>();
       LabelTypes labelTypes = ctx.getControl().getLabelTypes();