tests: wait a little longer (1sec) after gc and raise expected diff in memory tests
tests: wait a little longer (1sec) after gc and raise expected diff in memory tests

AppVeyor seems to have drastically-different result than locally, making
the second memory tests roughly at +3MB.

canalplus/rx-player,canalplus/rx-player,canalplus/rx-player,canalplus/rx-player,canalplus/rx-player