Wrong kernel size in lowest level posterior of PHiSeg

[baumgach]

In PHiSeg Posterior for lowest level

PHiSeg-code/phiseg/model_zoo/posteriors.py

Line 105 in c43f3b3

mu[i] = layers.conv2D(pre_z[i+resolution_levels-latent_levels], 'z%d_mu' % i, num_filters=zdim_0, activation=tf.identity)

should be convolutions with kernel=(1,1)