[setui] remove proto field not in F4.1

* system_profile_selection is not a concept in F4.1 so it should
  not have been CPed with the rest of the metric definition

Bug: 88539
Change-Id: I1a95ed04195517d7bb54a7afb63ba5ae9d5fe84a
diff --git a/fuchsia/setui/metrics.yaml b/fuchsia/setui/metrics.yaml
index 1c0c687..d6bb45d 100644
--- a/fuchsia/setui/metrics.yaml
+++ b/fuchsia/setui/metrics.yaml
@@ -52,7 +52,6 @@
     - report_name: per_device_counts
       id: 1
       report_type: UNIQUE_DEVICE_HISTOGRAMS
-      system_profile_selection: REPORT_ALL
       local_aggregation_period: WINDOW_1_DAY
       int_buckets:
         linear: