fix: match OLS GPG keyring filename between install and variables

Install script saves key as openlitespeed-archive-keyring.gpg but
variables.py referenced openlitespeed-keyring.gpg, causing apt
signed-by verification to fail during wo stack install.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

wo/core/variables.py

@@ -122,7 +122,7 @@ class WOVar():
     wo_ols_ctrl = '/usr/local/lsws/bin/lswsctrl'
 
     # OpenLiteSpeed repo and packages
-    wo_ols_repo = ("deb [signed-by=/usr/share/keyrings/openlitespeed-keyring.gpg] "
+    wo_ols_repo = ("deb [signed-by=/usr/share/keyrings/openlitespeed-archive-keyring.gpg] "
                    "http://rpms.litespeedtech.com/debian/ "
                    "{0} main".format(wo_platform_codename))