url: fix setting `url.search` to the empty string
Fixes: https://github.com/nodejs/node/issues/11101 Fixes: 98bb65f6 "url: improving URLSearchParams"
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines
Affected core subsystem(s)
url