test: point attest_userrun comment at the ported collide owner

test/wcc/data/attest_userrun.ww

@@ -9,7 +9,7 @@
 // the -T asm — exactly 1 `TEXT main.run` (user) + 1 `TEXT test.run` (lib
 // runner) — pinning #84 distinctness here in the REAL @test/-T path (a
 // dead-dup regression yields 0x main.run / 2x test.run). General
-// callability of the user run is gated separately by 989_barefn_collide.
+// callability of the user run is gated separately by test/xmod/collide_test.ww.
 package main;
 fn run() i32 = { return 9; };