Move configuration option to a system property

patches/server/Bundle-spark.patch

@@ -48,6 +48,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    public static final String ID = "spark";
 +    public static final String COMMAND_NAME = "spark";
 +
++    private static final String PREFER_SPARK_PLUGIN_PROPERTY = "paper.preferSparkPlugin";
++
 +    private static final int SPARK_YELLOW = 0xffc93a;
 +
 +    private final Logger logger;
@@ -164,7 +166,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    public static boolean isPluginPreferred() {
-+        return GlobalConfiguration.get().spark.preferSparkPlugin;
++        return Boolean.getBoolean(PREFER_SPARK_PLUGIN_PROPERTY);
 +    }
 +
 +    private static boolean isPluginEnabled(final Server server) {

patches/server/Paper-config-files.patch

@@ -549,7 +549,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    public class Spark extends ConfigurationPart {
 +        public boolean enabled = true;
 +        public boolean enableImmediately = false;
-+        public boolean preferSparkPlugin = false;
 +    }
 +
 +    @Deprecated(forRemoval = true)