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
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