[Blogging Prompts] Fix delay to show prompt card on "My Site" after tapping on "Undo"

When "Turn of prompts" is selected on "My Site" prompt card overflow menu, the SnackBar appears with the UNDO option. When UNDO is tapped, it takes a second for the prompt card to appear again.

Steps to reproduce

1 - Install Jetpack and log in;
2 - Select a site that is a blog (which means the prompt card will be shown on "My Site" -> "HOME");
3 - Tap on user avatar;
4 - Tap on "App Settings";
5 - Tap on "Debug Settings";
6 - Find and enable BloggingPromptsEnhancementsFeatureConfig;
7 - Go back to "My Site" -> "HOME";
8 - Tap on the prompt card overflow menu;
9 - Tap on "Turn off prompts" and then tap the UNDO button on the SnackBar: there is a delay of ~1 second before the prompt card is shown again.

Start with the BloggingPromptsEnhancementsFeatureConfig flow and the My Site > HOME prompt card, then trace the Turn off prompts action through the Snackbar UNDO handling. Verify that tapping UNDO restores the prompt card without the reported one-second delay.