Fix bug in ap_remove_module(), which caused problems for dso's

     who were the top_module.
PR:
Obtained from:
Submitted by:
Reviewed by:	Dean Gaudet, Marc Slemko


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@82102 13f79535-47bb-0310-9956-ffa450edef68