cros_build_lib.run: clean up error_code_ok->check migration

BUG=chromium:1006587
TEST=`./run_tests` passes

Change-Id: Ie416c5f7b16314a34a3a53f503469b3cc93fb9e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/1965957
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Chris McDonald <cjmcdonald@chromium.org>
diff --git a/api/router.py b/api/router.py
index 20d3140..df4094f 100644
--- a/api/router.py
+++ b/api/router.py
@@ -269,7 +269,7 @@
                 cmd,
                 enter_chroot=True,
                 chroot_args=chroot.get_enter_args(),
-                error_code_ok=True,
+                check=False,
                 extra_env=chroot.env)
           except cros_build_lib.RunCommandError:
             # A non-zero return code will not result in an error, but one