[perf][ui] Do not set Autotrace to false

- When removing an item completely, turning off auto
makes sense, but with recent changes, this gets in the way
of other actions upstream that will handle the same
functionality.

Change-Id: I20b4a3a6552ebdce2bbefc44b1c947d686b9cca5
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/1056681
Reviewed-by: Farid (Mojtaba) Faridzad <faridzad@google.com>
Commit-Queue: Tony Seaward <seawardt@google.com>
diff --git a/perf/modules/test-picker-sk/test-picker-sk.ts b/perf/modules/test-picker-sk/test-picker-sk.ts
index 8a553df..bb2a965 100644
--- a/perf/modules/test-picker-sk/test-picker-sk.ts
+++ b/perf/modules/test-picker-sk/test-picker-sk.ts
@@ -561,10 +561,6 @@
       if (fieldInfo.value !== value) {
         fieldInfo.value = value;
       }
-      if (value.length === 0) {
-        // Chart needs to be reset, so disable autoAddTrace.
-        this.autoAddTrace = false;
-      }
 
       if (value.length !== fieldInfo.field!.selectedItems.length) {
         // Selected Item Needs to be updated if the explore was removed.