Revert default for separate classloader to what it was in previous release

Author: gofraser

runtime/src/main/java/org/evosuite/runtime/RuntimeSettings.java

@@ -96,7 +96,7 @@ public class RuntimeSettings {
      * Should tests be executed in a separate instrumenting class loader
      * or with the standard classloader and instrumentation via an agent?
      */
-    public static boolean useSeparateClassLoader = true;
+    public static boolean useSeparateClassLoader = false;
 
     /**
      * If the class is serializable, then doing any change (adding hashCode, static reset, etc)