Complete the Styles test mock for the branch plugin API

The branch plugin API's Styles type gained shared and
changeViewIntegration. Building the plugin against the branch API
requires the test mock to provide them.

Depends-On: https://gerrit-review.googlesource.com/c/gerrit/+/646943
Change-Id: I2c0fd488cdd7b67876013da7b73e690f4fb473a0

web/test/test-setup.ts

diff --git a/web/test/test-setup.ts b/web/test/test-setup.ts
index 007174d..f60991b 100644
--- a/web/test/test-setup.ts
+++ b/web/test/test-setup.ts
@@ -24,9 +24,11 @@
     form: css``,
     material: css``,
     menuPage: css``,
+    shared: css``,
     spinner: css``,
     subPage: css``,
     table: css``,
     modal: css``,
+    changeViewIntegration: css``,
   },
 };