Report the right status report

:report_uuid is mandatory but wasn't used in the controller. Instead
it always returned .first - for unknown reason

Fixes #6124

src/api/app/controllers/status/reports_controller.rb

@@ -13,14 +13,11 @@ def show
   private
 
   def set_status_report
-    @status_report = @checkable.status_reports.first
-    @status_report = @checkable.status_reports.find_by(uuid: params[:uuid]) if params[:uuid]
-    return if @status_report
-
-    render_error(
-      status: 404,
-      errorcode: 'not_found',
-      message: 'Status report not found.'
-    )
+    if params[:report_uuid]
+      @status_report = @checkable.status_reports.find_by!(uuid: params[:report_uuid])
+    else
+      # request reports don't have uuid
+      @status_report = @checkable.status_reports.first
+    end
   end
 end