Reader: Increase number of lines for post tiles

[kean]

2 → 3 as there is a substantial number of posts where 2 is not enough, and 3 still looks great.

[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	29930
	Version	PR #25019
	Bundle ID	com.jetpack.alpha
	Commit	ea1f9e0
	Installation URL	6kd8hn2ati28g

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

[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	29930
	Version	PR #25019
	Bundle ID	org.wordpress.alpha
	Commit	ea1f9e0
	Installation URL	6cnit39scdr5g

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

[dangermattic]

	1 Warning
⚠️	This PR is assigned to the milestone 26.5 ❄️. The due date for this milestone has already passed. Please assign it to a milestone with a later deadline or check whether the release for this milestone has already been finished.

	1 Message
📖	This PR contains changes to RELEASE-NOTES.txt. Note that these changes won't affect the final version of the release notes as this version is in code freeze. Please, get in touch with a release manager if you want to update the final release notes.

Generated by 🚫 Danger

[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