Inline settings.pluginFiles.name

In theory the warning is more noisy now, but in practice this will not
happen unless the client is older than 2.14 (highly unlikely).

src/libstore/daemon.cc

@@ -246,10 +246,9 @@ struct ClientSettings
                     // the daemon, as that could cause some pretty weird stuff
                     if (parseFeatures(tokenizeString<StringSet>(value)) != experimentalFeatureSettings.experimentalFeatures.get())
                         debug("Ignoring the client-specified experimental features");
-                } else if (name == settings.pluginFiles.name) {
-                    if (tokenizeString<Paths>(value) != settings.pluginFiles.get())
-                        warn("Ignoring the client-specified plugin-files.\n"
-                             "The client specifying plugins to the daemon never made sense, and was removed in Nix >=2.14.");
+                } else if (name == "plugin-files") {
+                    warn("Ignoring the client-specified plugin-files.\n"
+                         "The client specifying plugins to the daemon never made sense, and was removed in Nix >=2.14.");
                 }
                 else if (trusted
                     || name == settings.buildTimeout.name

src/libstore/remote-store.cc

@@ -128,7 +128,7 @@ void RemoteStore::setOptions(Connection & conn)
         overrides.erase(settings.useSubstitutes.name);
         overrides.erase(loggerSettings.showTrace.name);
         overrides.erase(experimentalFeatureSettings.experimentalFeatures.name);
-        overrides.erase(settings.pluginFiles.name);
+        overrides.erase("plugin-files");
         conn.to << overrides.size();
         for (auto & i : overrides)
             conn.to << i.first << i.second.value;