JDWP Tests: Make ClassLoaderTest more precise

Check the expectation that the debuggee class has a non-zero
classloader, that is, not the boot classloader, while java.lang.Object
has a zero classloader, that is, the boot classloader.

Bug: 26349019
Change-Id: If224deabc8fc9c08f1bf7deb579f48f0893d6850
1 file changed