fix --pagespeed with nginxmainline

Author: iam404

ee/cli/plugins/site.py

@@ -1266,7 +1266,7 @@ def doupdatesite(self, pargs):
         data['ee_db_host'] = check_site.db_host
         data['old_pagespeed_status'] = check_site.is_pagespeed
 
-        if not (pargs.letsencrypt or pargs.letsencrypt == "off"):
+        if not pargs.letsencrypt:
             try:
                 pre_run_checks(self)
             except SiteError as e:

ee/cli/plugins/stack.py

@@ -1668,7 +1668,7 @@ def install(self, packages=[], apt_packages=[], disp_msg=True):
                     Log.info(self, "Mail server is already installed")
 
             if self.app.pargs.pagespeed:
-                if not EEAptGet.is_installed(self, 'nginx-custom'):
+                if not (EEAptGet.is_installed(self, 'nginx-custom') or EEAptGet.is_installed(self, 'nginx-mainline')):
                     self.app.pargs.nginx = True
                 else:
                     Log.info(self, "Nginx already installed")