only reset request level filters in reset_filters(), else for example

TLSFilter gets wiped out, breaking any response that comes through ap_die
(including the frequent '304 not modified')
PR:
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@89601 13f79535-47bb-0310-9956-ffa450edef68