Fix legacy_swiftui_aspect_ratio not preserving whitespace (#6883)

[CraigSiemens]

Fixes #6883 by editing the baseName of the MemberAccessExprSyntax to preserve the existing trivia (whitespace) around the function call.

Previously it was creating a new expression for the function call so the result would always be on one line.

[SwiftLintBot]

	20 Messages
📖	Building this branch resulted in a binary size of 28460.6 KiB vs 28460.51 KiB when built on main (0% larger).
📖	Linting Aerial with this PR took 0.1 s vs 0.11 s on main (9% faster).
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📖	Linting Brave with this PR took 0.41 s vs 0.4 s on main (2% slower).
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📖	Linting Moya with this PR took 0.11 s vs 0.11 s on main (0% slower).
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📖	Linting Nimble with this PR took 0.11 s vs 0.13 s on main (15% faster).
📖	Linting PocketCasts with this PR took 0.5 s vs 0.53 s on main (5% faster).
📖	Linting Quick with this PR took 0.12 s vs 0.08 s on main (49% slower).
📖	Linting Realm with this PR took 0.19 s vs 0.21 s on main (9% faster).
📖	Linting Sourcery with this PR took 0.19 s vs 0.17 s on main (11% slower).
📖	Linting Swift with this PR took 0.21 s vs 0.21 s on main (0% slower).
📖	Linting SwiftLintPerformanceTests with this PR took 3.73 s vs 3.73 s on main (0% slower).
📖	Linting VLC with this PR took 0.19 s vs 0.18 s on main (5% slower).
📖	Linting Wire with this PR took 0.79 s vs 0.79 s on main (0% slower).
📖	Linting WordPress with this PR took 0.61 s vs 0.6 s on main (1% slower).

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[SimplyDanny]

Thanks @CraigSiemens!