BUG/MINOR: h3: do not report bug on unknown method

Remove an unneeded BUG_ON statement when find_http_meth() returns
HTTP_METH_OTHER.

This fix is necessary to support requests with unusual methods with
DEBUG_STRICT activated. This was detected when browsing with HTTP/3 over
a nextcloud instance which uses PROPFIND method for Webdav.
diff --git a/src/h3.c b/src/h3.c
index 14ae2c4..3ff45ff 100644
--- a/src/h3.c
+++ b/src/h3.c
@@ -321,7 +321,6 @@
 		sl->flags |= HTX_SL_F_BODYLESS;
 
 	sl->info.req.meth = find_http_meth(meth.ptr, meth.len);
-	BUG_ON(sl->info.req.meth == HTTP_METH_OTHER);
 
 	if (isttest(authority))
 		htx_add_header(htx, ist("host"), authority);