Fix horizontal insets in Reader article view

[kean]

Fixes incorrect horizontal insets. AFAIR the extra padding was added for iOS 26 betas. In the production version, it is not needed. It results in invalid layout.

Before / After

[wpmobilebot]

📲 You can test the changes from this Pull Request in WordPress by scanning the QR code below to install the corresponding build.

	App Name	WordPress
	Configuration	Release-Alpha
	Build Number	29912
	Version	PR #25010
	Bundle ID	org.wordpress.alpha
	Commit	f51e132
	Installation URL	36ehri75gv8l0

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[wpmobilebot]

📲 You can test the changes from this Pull Request in Jetpack by scanning the QR code below to install the corresponding build.

	App Name	Jetpack
	Configuration	Release-Alpha
	Build Number	29912
	Version	PR #25010
	Bundle ID	com.jetpack.alpha
	Commit	f51e132
	Installation URL	3vfli48reff98

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud