fix: Increase timeout when checking installed Nightly extension.

[Pawel-Szydlo]

Description

When the user has a dozen extensions, Nightly has stopped detecting correctly. Nightly is injected a few milliseconds later.

Increasing the time to check whether an extension is installed solves this problem.

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

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