cbuildbot: fix some old pre_cq config refs

Delete more references that unittests missed.

BUG=chromium:1025955
TEST=CQ passes

Change-Id: I70d470d0e8ff7987123de329045aa6a3fa5d396a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/2121481
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
diff --git a/scripts/cbuildbot_unittest.py b/scripts/cbuildbot_unittest.py
index fdeb26f..be47113 100644
--- a/scripts/cbuildbot_unittest.py
+++ b/scripts/cbuildbot_unittest.py
@@ -26,8 +26,7 @@
     options = cbuildbot.ParseCommandLine(parser, argv)
     options.buildbot = False
 
-    build_config = dict(pre_cq=False,
-                        manifest_version=False)
+    build_config = dict(manifest_version=False)
     chrome_rev = None
 
     def _TestConfig(expected):
@@ -40,10 +39,6 @@
     # Default options.
     _TestConfig(False)
 
-    build_config['pre_cq'] = True
-    _TestConfig(True)
-
-    build_config['pre_cq'] = False
     build_config['manifest_version'] = True
     # Not running in buildbot mode even though manifest_version=True.
     _TestConfig(False)