Disable triagebot's glacier handler

Author: fmease

triagebot.toml

@@ -44,8 +44,6 @@ remove_labels = ["S-waiting-on-author"]
 # Those labels are added when PR author requests a review from an assignee
 add_labels = ["S-waiting-on-review"]
 
-[glacier]
-
 [ping.icebreakers-llvm]
 message = """\
 Hey LLVM ICE-breakers! This bug has been identified as a good