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)

Related Issue

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• [ ] Did you add a function?
• [ ] Did you add the tests?
• [x] Did you run your tests and are your tests passing?
• [x] Did pre-commit not fail on any check?
• [x] Did you follow the steps we provided?

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Thank you for this PR, here is the CI results:

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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