Fix whitespace issue in rewriter of redundant_optional_initialization rule

[SimplyDanny]

Fixes #4794.

[SwiftLintBot]

	18 Messages
📖	Linting Aerial with this PR took 0.14s vs 0.16s on main (12% faster)
📖	Linting Alamofire with this PR took 0.12s vs 0.13s on main (7% faster)
📖	Linting Brave with this PR took 0.57s vs 0.57s on main (0% slower)
📖	Linting DuckDuckGo with this PR took 0.3s vs 0.3s on main (0% slower)
📖	Linting Firefox with this PR took 0.52s vs 0.53s on main (1% faster)
📖	Linting Kickstarter with this PR took 0.69s vs 0.69s on main (0% slower)
📖	Linting Moya with this PR took 0.12s vs 0.12s on main (0% slower)
📖	Linting NetNewsWire with this PR took 0.25s vs 0.25s on main (0% slower)
📖	Linting Nimble with this PR took 0.09s vs 0.09s on main (0% slower)
📖	Linting PocketCasts with this PR took 0.54s vs 0.54s on main (0% slower)
📖	Linting Quick with this PR took 0.06s vs 0.06s on main (0% slower)
📖	Linting Realm with this PR took 0.5s vs 0.52s on main (3% faster)
📖	Linting SourceKitten with this PR took 0.08s vs 0.08s on main (0% slower)
📖	Linting Sourcery with this PR took 0.22s vs 0.22s on main (0% slower)
📖	Linting Swift with this PR took 0.95s vs 0.97s on main (2% faster)
📖	Linting VLC with this PR took 0.15s vs 0.15s on main (0% slower)
📖	Linting Wire with this PR took 0.63s vs 0.63s on main (0% slower)
📖	Linting WordPress with this PR took 0.87s vs 0.86s on main (1% slower)

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