Fix model loading in code-owners-banner
Fix model loading in code-owners-banner

Due to a misnamed method the plugin status and branch config were not
loaded from the banner. This has only surfaced as a problem after
change 321821 changed the reply dialog to render lazily. Until then the
banner was lucky that other components would load the required data into
the model without having to do that itself.

Google-Bug-Id: b/204446219
Change-Id: If7f9a468b105f70df677ffb46d238eef76c3c3d7

GerritCodeReview/plugins_code-owners,GerritCodeReview/plugins_code-owners,GerritCodeReview/plugins_code-owners,GerritCodeReview/plugins_code-owners