SwiftUI: Prefer scaledToFit()/scaledToFill() over aspectRatio(contentMode:)

[ikelax]

Adresses #5713.

[SwiftLintBot]

	1 Warning
⚠️	If this is a user-facing change, please include a CHANGELOG entry to credit yourself! You can find it at CHANGELOG.md.

	17 Messages
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Here's an example of your CHANGELOG entry:

* SwiftUI: Prefer scaledToFit()/scaledToFill() over aspectRatio(contentMode:).  
  [ikelax](https://github.com/ikelax)
  [#issue_number](https://github.com/realm/SwiftLint/issues/issue_number)

note: There are two invisible spaces after the entry's text.

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