pi2bz: don't actually strip signature

Fix logic bug in the new function.

Signed-off-by: Konstantin Ryabitsev <konstantin@linuxfoundation.org>
diff --git a/src/bugspray/pi2bz.py b/src/bugspray/pi2bz.py
index 10ab4a9..7a60ddc 100644
--- a/src/bugspray/pi2bz.py
+++ b/src/bugspray/pi2bz.py
@@ -105,7 +105,7 @@
                 # Check fine trigger, if configured
                 trigger_res = pconf.get('trigger_regexes', list())
                 if trigger_res:
-                    payload = bugspray.msg_get_payload(msg, strip_quoted=True, strip_signature=True)
+                    payload = bugspray.msg_get_payload(msg, strip_quoted=True, strip_signature=False)
                     found = False
                     for trigger_re in trigger_res:
                         matches = re.search(trigger_re, payload, flags=re.I | re.M)