[image_picker] Fix ios scaling in portrait mode

[Xavjer]

Description

Fixes the issue, that within image_picker when taking a picture on iOS in Portrait mode, the scaling did not work as intended (AspectRatio was flipped)

Related Issues

flutter/flutter#40334 => Will be fixed with this PR

Checklist

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  => No new unit tests added, as the existing should already cover this, but the image did not have the values that were returned from the channel.
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Breaking Change

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[Xavjer]

@googlebot I fixed it.

[Xavjer]

Reopening due to wrong commiter idenitity

[Xgamefactory]

issue still on lates version image_picker: ^0.6.1+4

[Xavjer]

@Xgamefactory this PR was not merged, recreated in #2061 but not merged yet, therefore the error still exists