Rule out testcase 660 from no-image variant

Test case 660 test for the behaviour of compiler when pre-initialize
classes into app image, for test with --no-image flag, the compiler will
not try to generate app image hence won't do pre-initialization, which
break the assumptions in the test case.

Test: testrunner.py --host --no-image -t 660
Change-Id: I87889c8af73065823443fa974b9e812f5b959e53