Update drupal-auth.conf

Small fix for Drupal 8. D8 uses "Login attempt failed from" while D7 uses "Login attempt failed for".
The referer part is a must currently, but some requests did not have one and are not failing.

config/filter.d/drupal-auth.conf

@@ -14,7 +14,7 @@ before = common.conf
 
 [Definition]
 
-failregex = ^%(__prefix_line)s(https?:\/\/)([\da-z\.-]+)\.([a-z\.]{2,6})(\/[\w\.-]+)*\|\d{10}\|user\|<HOST>\|.+\|.+\|\d\|.*\|Login attempt failed for .+\.$
+failregex = ^%(__prefix_line)s(https?:\/\/)([\da-z\.-]+)\.([a-z\.]{2,6})(\/[\w\.-]+)*\|\d{10}\|user\|<HOST>\|.+\|.*\|\d\|.*\|Login attempt failed (?:for|from) .+\.$
 
 ignoreregex =