Stats: remove avg "view more" link

[nbradbury]

Partially resolves #21451

As noted in the issue, tapping this link in stats does nothing because this line of code explicitly states to do nothing.

It turns out this was simply due to fixing a warning about a non-exhaustive when clause.

We don't have a screen for average daily views and creating one doesn't seem like a priority, so this PR simply removes the "View more" link. I've filed #21458 as a reminder that we should add that screen at some point to match iOS.

[dangermattic]

	1 Warning
:warning:	PR is not assigned to a milestone.

Generated by :no_entry_sign: Danger

[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
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr21457-ba6d8d6
	Commit	ba6d8d6c650a918c74d29f59b4a58b9cf462f196
	Direct Download	jetpack-prototype-build-pr21457-ba6d8d6.apk

Note: Google Login is not supported on these builds.

[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
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr21457-ba6d8d6
	Commit	ba6d8d6c650a918c74d29f59b4a58b9cf462f196
	Direct Download	wordpress-prototype-build-pr21457-ba6d8d6.apk

Note: Google Login is not supported on these builds.

[sonarcloud[bot]]

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

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 39.50%. Comparing base (a81d9ef) to head (ba6d8d6). Report is 12 commits behind head on trunk.

Files with missing lines	Patch %	Lines
...resh/lists/detail/PostAverageViewsPerDayUseCase.kt	66.66%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## trunk #21457 +/- ## ======================================= Coverage 39.50% 39.50% ======================================= Files 2119 2119 Lines 99437 99437 Branches 15282 15282 ======================================= Hits 39281 39281 Misses 56674 56674 Partials 3482 3482 ```

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