Fix NGINX API download regex

Users are allowed to supply namespace%2Fproject instead of a numeric ID

lib/support/nginx/gitlab

@@ -125,7 +125,7 @@ server {
     return 418;
   }
-  location ~ ^/api/v3/projects/[0-9]+/repository/archive {
+  location ~ ^/api/v3/projects/.*/repository/archive {
     # 'Error' 418 is a hack to re-use the @gitlab-git-http-server block
     error_page 418 = @gitlab-git-http-server;
     return 418;

lib/support/nginx/gitlab-ssl

@@ -172,7 +172,7 @@ server {
     return 418;
   }
-  location ~ ^/api/v3/projects/[0-9]+/repository/archive {
+  location ~ ^/api/v3/projects/.*/repository/archive {
     # 'Error' 418 is a hack to re-use the @gitlab-git-http-server block
     error_page 418 = @gitlab-git-http-server;
     return 418;