remove unused fixPatch

nix/master.nix

@@ -410,19 +410,10 @@ in
           "${if hasSSL then "https" else "http"}://${cfg.domain}/";
         dbUrl = config.services.buildbot-nix.master.dbUrl;
         package =
-          let
-            fixPatch = { patch, name }:
-              pkgs.runCommand "${name}.patch" { } ''
-                sed -r \
-                  's~^(---|\+\+\+) (a|b)/master/(.+)$~\1 \2/\3~' \
-                  ${patch} >$out
-              '';
-          in
           cfg.package.overrideAttrs (old: {
             patches =
               old.patches ++ [
                 ./0001-Support-per-installation-tokens-in-GithubStatusPush-.patch #;
-
               ];
           });
         pythonPackages = ps: [