Remove utf-8 garbage from ikiwiki

diff --git a/ikiwiki b/ikiwiki
index 84fa7a5c4115715eb172fdefbe51c1d0439516b5..3904e1dacca16e5240af97584cf43fd6e8c5166f 160000 (submodule)
--- a/ikiwiki
+++ b/ikiwiki
@@ -1 +1 @@
-Subproject commit 84fa7a5c4115715eb172fdefbe51c1d0439516b5
+Subproject commit 3904e1dacca16e5240af97584cf43fd6e8c5166f