Update ikiwiki submodule

diff --git a/ikiwiki b/ikiwiki
index e1e69609a10733a80c7d70810cc83f2c34026d02..8afcccbcfc6003057a6219ff4a101208fa8601d3 160000 (submodule)
--- a/ikiwiki
+++ b/ikiwiki
@@ -1 +1 @@
-Subproject commit e1e69609a10733a80c7d70810cc83f2c34026d02
+Subproject commit 8afcccbcfc6003057a6219ff4a101208fa8601d3