Fix group suggestions

Bug: Issue 15293
Change-Id: Id420aaeb0303c1d7f041dd0fdc6558dc7ffbe43a
(cherry picked from commit 9f330078a7b91ed3c97ef53940c5ce97c0192533)
diff --git a/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface.ts b/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface.ts
index 2c5fff6..7a39838 100644
--- a/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface.ts
+++ b/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface.ts
@@ -1907,7 +1907,7 @@
       params.n = n;
     }
     if (project) {
-      params.p = encodeURIComponent(project);
+      params.p = project;
     }
     return this._restApiHelper.fetchJSON({
       url: '/groups/',