Stop downloading the installers on every restart

The installers are 220 MB together. That is 220 MB that is downloaded
every time your node is restarted, which is at least once a day for
most people. For a Freenet developer this gets painful.

It may take 30 minutes to download them, which is time you want to
spend downloading other things. It loads the network unnecessarily.
The installers are only useful for darknet mode and the downloads can
be started manually.

Author: Trivuele

src/freenet/node/updater/NodeUpdateManager.java

@@ -343,7 +343,7 @@ public void set(Boolean val)
 
 		updateSeednodes = updaterConfig.getBoolean("updateSeednodes");
 
-		updaterConfig.register("updateInstallers", wasEnabledOnStartup, 6,
+		updaterConfig.register("updateInstallers", false, 6,
 				true, true, "NodeUpdateManager.updateInstallers",
 				"NodeUpdateManager.updateInstallersLong",
 				new BooleanCallback() {