Remove unneeded `Option` map in `PyMultiHostUrl.build` #5713

Job	Run time
build on ${{ matrix.os }} (${{ matrix.target }} - ${{ matrix.interpreter \|\| 'all' }}${{ (((matrix.os == 'linux') && format(' - {0}', (((matrix.manylinux == 'auto') && 'manylinux') \|\| matrix.manylinux))) \|\| '') }})	0s
build pgo-optimized on ${{ matrix.os }} / ${{ matrix.interpreter }}	0s
rust benchmarks	2m 9s
build sdist	21s
build-wasm-emscripten	2m 42s
coverage	1m 19s
lint	47s
test-debug 3.13	50s
test MSRV	2m 38s
test-debug pypy3.10	3m 17s
test on ubuntu	1m 53s
test on macos	2m 8s
test-pydantic-integration	1m 16s
test on windows	4m 1s
test 3.9	2m 1s
test 3.10	1m 58s
test 3.11	1m 57s
test 3.12	1m 48s
test 3.13	1m 46s
test 3.13t	2m 10s
test pypy3.9	4m 10s
test pypy3.10	4m 7s
test build on ${{ matrix.os }}	0s
test build on ${{ matrix.target }}-${{ matrix.distro }}	0s
inspect-pypi-assets	0s
check	2s
release	0s
	43m 20s

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