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: I7cffd5a40c5e51a296d7e5edd63e0d56c18a5cc0

web/test/test-setup.ts

diff --git a/web/test/test-setup.ts b/web/test/test-setup.ts
index 3e47525..508eb14 100644
--- a/web/test/test-setup.ts
+++ b/web/test/test-setup.ts
@@ -12,9 +12,11 @@
     form: css``,
     material: css``,
     menuPage: css``,
+    shared: css``,
     spinner: css``,
     subPage: css``,
     table: css``,
     modal: css``,
+    changeViewIntegration: css``,
   },
 };