Fix Threats Copy Change

[romeluis]

Description

This pull request makes a minor update to the JetpackScanStatusViewModel.swift file. The change improves the wording of the details message shown to users while threats are being fixed in the background. No functional changes were made. Linked to issue #15840

Testing instructions

No testing, simple string change.

[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

[crazytonyli]

Thanks for the changes!

[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	30028
	Version	PR #25032
	Bundle ID	org.wordpress.alpha
	Commit	bb41ea4
	Installation URL	72ksd5fkj08l8

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 Jetpack by scanning the QR code below to install the corresponding build.

	App Name	Jetpack
	Configuration	Release-Alpha
	Build Number	30028
	Version	PR #25032
	Bundle ID	com.jetpack.alpha
	Commit	bb41ea4
	Installation URL	7qbumnp6mqe0g

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