bug: v2 telemetry for Cody installations not being fired

[dadlerj]

Version

Current/all

Describe the bug

The v2 cody.extension / installed event seems to ~~ never be logged (we have tens of thousands of cody.extension / savedLogin events fired per day, but single digit cody.extension / installed ones: https://sourcegraph.sourcegraph.com/github.com/sourcegraph/cody/-/blob/vscode/src/services/telemetry-v2.ts?L139

One of the two parameters in the conditional must be incorrectly set.

Expected behavior

New installations should fire the event as expected

Additional context

Slack discussion