GerritToGitBlitUserModel#canAccess: Restore return statement

In I85be123b20 return statement statement was inadvertently deleted.

Change-Id: I74a7dd8084b40ec99c7a8e0a233f93b705f55644

Author: davido

src/main/java/com/googlesource/gerrit/plugins/gitblit/auth/GerritToGitBlitUserModel.java

@@ -118,7 +118,7 @@ protected boolean canAccess(
               .project(project)
               .testOrFalse(ProjectPermission.RUN_UPLOAD_PACK);
         case PUSH:
-          permissionBackend
+          return permissionBackend
               .user(userProvider)
               .project(project)
               .testOrFalse(ProjectPermission.RUN_RECEIVE_PACK);