also remove chain for bugs-master ssl cert

The cert is no longer a gandi-issued, so we should use the letsencrypt
chain.

Signed-off-by: Julien Cristau <jcristau@debian.org>

diff --git a/modules/ssl/files/chains/bugs-master.debian.org.crt b/modules/ssl/files/chains/bugs-master.debian.org.crt
deleted file mode 120000 (symlink)
index 50d224a..0000000
--- a/modules/ssl/files/chains/bugs-master.debian.org.crt
+++ /dev/null
@@ -1 +0,0 @@
-GANDI-2-CA
\ No newline at end of file