tests: Modify finalizer test so there's more chance it passes
tests: Modify finalizer test so there's more chance it passes

Current linux builds don't always collect the Context instance: invoking the
test file directly on the command line is ok, but when ran via run-tests the
finalizer isn't called due to something in the gc... Adding two variables fixes
this for now.

stinos/micropython-wrap,stinos/micropython-wrap,stinos/micropython-wrap