[connectivity_wlan] Add missing reason dimension

A reason code dimension for the bss_selection_count_detailed metric is
missing in the config. This change adds that dimension back in. The
logging implementation already logs a dimension as intended.

Bug: 129053
Change-Id: Id0cdc61887bb913db2298510b72e2d861fd82cda
Reviewed-on: https://fuchsia-review.googlesource.com/c/cobalt-registry/+/871296
Fuchsia-Auto-Submit: Hayden Nix <haydennix@google.com>
Privacy-Approval: Francois Rousseau <frousseau@google.com>
Reviewed-by: Francois Rousseau <frousseau@google.com>
Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>
(cherry picked from commit 1d4b88fe5d8dd8059e9f32d7b83516ec093aa261)
diff --git a/fuchsia/connectivity_wlan/metrics.yaml b/fuchsia/connectivity_wlan/metrics.yaml
index 6196ffd..fcaebd3 100644
--- a/fuchsia/connectivity_wlan/metrics.yaml
+++ b/fuchsia/connectivity_wlan/metrics.yaml
@@ -3196,6 +3196,8 @@
 - id: 6200
   metric_name: bss_selection_count_detailed
   <<: *occurrence_metric_template__metric_portion
+  metric_dimensions:
+    - *connect_reason_dim
   reports:
     - id: 1
       report_name: device_daily_occurrence_histogram