fix tf get item with non 0 dim tensor queries

[mattbarrett98]

fixes something like the following:

import ivy
ivy.set_tensorflow_backend()
x = ivy.array([[0.]])
print(x[(slice(None, None, None), ivy.array([0]))])

where non 0 dimensional tensors are used in the query. there was a check filtering out non 0 dim boolean tensors, but i think this needs to be extensed to any non 0 dim tensor, as i've done. I also believe the fix you made @Ishticode is no longer necessary after this fix, so i removed this as well. Do you think we can add some of these cases to the get item tests @Ishticode ?

[vedpatwardhan]

lgtm! Feel free to merge the PR, thanks @mattbarrett98 😄