refactor(ivy.linear): remove unneeded list()

[lucasalavapena]

PR Description

We had an unneeded list() call, I also got rid of the slice since for two values it seemed unneeded to me at least (plus you are creating a new list with a slice operation)

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• Did you add the tests?
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Failed tests:

This PR introduces the following new failing tests:
ivy_tests/test_ivy/test_functional/test_experimental/test_core/test_elementwise.py::test_diff,paddle
ivy_tests/test_ivy/test_frontends/test_tensorflow/test_math.py::test_tensorflow_scalar_mul,numpy
ivy_tests/test_ivy/test_frontends/test_tensorflow/test_math.py::test_tensorflow_scalar_mul,jax
ivy_tests/test_ivy/test_frontends/test_tensorflow/test_math.py::test_tensorflow_scalar_mul,tensorflow
ivy_tests/test_ivy/test_frontends/test_tensorflow/test_math.py::test_tensorflow_scalar_mul,torch
ivy_tests/test_ivy/test_functional/test_experimental/test_core/test_elementwise.py::test_count_nonzero,torch
ivy_tests/test_ivy/test_functional/test_experimental/test_core/test_manipulation.py::test_partial_vec_to_tensor,paddle