gitweb: Set correct access rights after enabling application

- after enabling application, do not enable Apache auth configuration
  if a public repository exist.

Closes #1669

Signed-off-by: Veiko Aasa <veiko17@disroot.org>
Reviewed-by: Sunil Mohan Adapa <sunil@medhas.org>

plinth/modules/gitweb/__init__.py

@@ -147,6 +147,12 @@ class GitwebWebserverAuth(Webserver):
         repos = app.get_repo_list()
         return have_public_repos(repos) or super().is_enabled()
 
+    def enable(self):
+        """Enable apache configuration only if no public repository exists."""
+        repos = app.get_repo_list()
+        if not have_public_repos(repos):
+            super().enable()
+
 
 def init():
     """Initialize the module."""