Fix TFConvBertModelIntegrationTest::test_inference_masked_lm Test
@abhishekkrthakur - this doesn't look good to me. 

Just changing the hardcoded integration test to values that make the test pass does not seem like the way to go here. The PyTorch integration test: https://github.com/huggingface/transformers/blob/7c7962ba891864f9770b9e9424f87d158b839a59/tests/test_modeling_convbert.py#L430 still has the old values and passes, which to me is an indicator that the TF implementation or the PyTorch implementation is not correct.

Also, it would be great if we could not merge PRs that have no description and that neither @sgugger, @LysandreJik or I approved.