Fix the "404 NOT FOUND" error on GitWeb / Gerrit 2.5.

The problem was about projectOwner (or administrator)
not being able to browse through GitWeb, even if
effectively authorised to see all project branches
and permissions.

The "project.allRefsAreVisible()" alone did not allow
visibility to even the project owner and Gerrit
administrators because they had no direct "read"
permissions to refs/meta/config (this was implicitly
implied by the ownership but not included in GitWebServlet)

Change-Id: I93bfade1765cb7c834c9865d86a57304b497b9ed

gerrit-httpd/src/main/java/com/google/gerrit/httpd/gitweb/GitWebServlet.java

@@ -370,7 +370,7 @@ class GitWebServlet extends HttpServlet {
     final ProjectControl project;
     try {
       project = projectControl.validateFor(nameKey);
-      if (!project.allRefsAreVisible()) {
+      if (!project.allRefsAreVisible() && !project.isOwner()) {
          // Pretend the project doesn't exist
         throw new NoSuchProjectException(nameKey);
       }