test: cleanup test-buffer-sharedarraybuffer

remove third argument `0` from calls to `assert.deepStrictEqual`

PR-URL: https://github.com/nodejs/node/pull/15896


Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>