chore(security): clean up accept-flake-config mistakes

Signed-off-by: Raito Bezarius <masterancpp@gmail.com>

buildbot_nix/__init__.py

@@ -436,8 +436,6 @@ class NixBuildCommand(buildstep.ShellMixin, steps.BuildStep):
 
         return cmd.results()
 
-
-
 def nix_eval_config(
     gerrit_config: GerritConfig,
     project: GerritProject,
@@ -480,9 +478,6 @@ def nix_eval_config(
                 str(worker_count),
                 "--max-memory-size",
                 str(max_memory_size),
-                "--option",
-                "accept-flake-config",
-                "true",
                 "--gc-roots-dir",
                 drv_gcroots_dir,
                 "--force-recurse",
@@ -543,7 +538,6 @@ def nix_build_config(
                 # stop stuck builds after 20 minutes
                 "--max-silent-time",
                 str(60 * 20),
-                "--accept-flake-config",
                 "--builders",
                 builders_spec,
                 "--out-link",