Fix wsl_v5 spacing in MergeByCampaignID

Add blank lines around the dedup-and-connector-ID block to satisfy
the wsl_v5 linter (blank line after an if-block, above an assignment
following a block, and above an if with no shared variables in the
preceding line).

Signed-off-by: Bryan Frimin <bryan@probo.com>

pkg/coredata/access_review_campaign_source.go

@@ -166,9 +166,11 @@ func (sources *AccessReviewCampaignSources) MergeByCampaignID(
 		if _, ok := seen[source.ID]; ok {
 			continue
 		}
+
 		seen[source.ID] = struct{}{}
 
 		var connectorID *string
+
 		if source.ConnectorID != nil {
 			s := source.ConnectorID.String()
 			connectorID = &s