Fix boolean mask asignment scalar

[oleksandr-pavlyk]

Fix for

import dpnp
x = dpnp.random.randn(200)
x[x<0] = 0   # used to raise TypeError, expecting r.h.s. to be a 0-d usm_ndarray 

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[github-actions]

View rendered docs @ https://intelpython.github.io/dpctl/pulls/1101/index.html

[coveralls]

Coverage: 82.378% (+0.02%) from 82.363% when pulling c162c2a on fix-boolean-mask-asignment-scalar into d259247 on master.

[github-actions]

Array API standard conformance tests for dpctl=0.14.1dev3=py310h76be34b_5 ran successfully.
Passed: 36
Failed: 798
Skipped: 280

[github-actions]

Deleted rendered PR docs from intelpython.github.com/dpctl, latest should be updated shortly. 🤞

[github-actions]

Array API standard conformance tests for dpctl=0.14.1dev3=py310h76be34b_5 ran successfully.
Passed: 36
Failed: 798
Skipped: 280