Don't open welcome page on extension update

[Dineshs91]

TL;DR

Simplified the extension's onInstalled event handler to only open the welcome page on initial installation, not on updates.

What changed?

• Removed the condition that checks for "update" reason in the onInstalled event listener
• Removed the URL parameter ?updated=true that was previously added for update events
• Simplified the welcome page URL to always be https://typefully.com/minimal-twitter/welcome without any query parameters

How to test?

1. Install the extension for the first time and verify the welcome page opens
2. Update the extension and verify the welcome page does not open
3. Trigger other installation events and verify the welcome page does not open

Why make this change?

This change improves user experience by only showing the welcome page to new users, preventing interruptions for existing users when the extension updates. This reduces potential annoyance from having the welcome page repeatedly open after extension updates.

Fix MIN-36

[Dineshs91]

• Add an option to hide bookmark count #243
• Fix notification count and red dot not hidden in title #242
• In zen mode overflowing content should be scrollable #241
• Don't open welcome page on extension update #240 👈 (View in Graphite)
• main

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[Dineshs91]

Merge activity

• Apr 30, 11:26 AM EDT: A user started a stack merge that includes this pull request via Graphite.
• Apr 30, 11:26 AM EDT: @Dineshs91 merged this pull request with Graphite.