Make sure not to trigger getInitialProps on nav back from hash

[ijjk]

As mentioned in the thread this.asPath wasn't being set on a hash only change causing successive checks for hash only changes to return false. I added another test to the client-navigation suite to make sure this doesn't regress.

Fixes: #2825
Closes: #5519

[github-actions]

Stats from current PR

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	zeit/next.js canary	ijjk/next.js fix/hash-change-gip	Change
Build Duration	15.7s	15.5s	-212ms
node_modules Size	39.1 MB	39.1 MB	⚠️ +59 B
Total Bundle (main, webpack, commons) Size	209 kB	209 kB	⚠️ +11 B
Total Bundle (main, webpack, commons) gzip Size	68.5 kB	68.5 kB	⚠️ +3 B
Client _app Size	2.6 kB	2.6 kB	✓
Client _app gzip Size	1.07 kB	1.07 kB	✓
Client _error Size	8.19 kB	8.19 kB	✓
Client _error gzip Size	3.12 kB	3.12 kB	✓
Client pages/index Size	288 B	288 B	✓
Client pages/index gzip Size	222 B	222 B	✓
Client pages/link Size	4.78 kB	4.78 kB	✓
Client pages/link gzip Size	2.09 kB	2.09 kB	✓
Client pages/routerDirect Size	411 B	411 B	✓
Client pages/routerDirect gzip Size	296 B	296 B	✓
Client pages/withRouter Size	393 B	393 B	✓
Client pages/withRouter gzip Size	280 B	280 B	✓
Client main Size	23.3 kB	23.3 kB	✓
Client main gzip Size	7.63 kB	7.63 kB	✓
Client commons Size	183 kB	183 kB	⚠️ +11 B
Client commons gzip Size	59.5 kB	59.5 kB	⚠️ +3 B
Client webpack Size	1.49 kB	1.49 kB	✓
Client webpack gzip Size	769 B	769 B	✓
Base Rendered Size	1.34 kB	1.34 kB	✓
Build Dir Size	802 kB	802 kB	⚠️ +53 B

Click to expand serverless stats

	zeit/next.js canary	ijjk/next.js fix/hash-change-gip	Change
Build Duration	16.7s	16.6s	-107ms
node_modules Size	39.1 MB	39.1 MB	⚠️ +59 B
Total Bundle (main, webpack, commons) Size	209 kB	209 kB	⚠️ +11 B
Total Bundle (main, webpack, commons) gzip Size	68.5 kB	68.5 kB	⚠️ +3 B
Client _app Size	2.6 kB	2.6 kB	✓
Client _app gzip Size	1.07 kB	1.07 kB	✓
Client _error Size	8.19 kB	8.19 kB	✓
Client _error gzip Size	3.12 kB	3.12 kB	✓
Client pages/index Size	288 B	288 B	✓
Client pages/index gzip Size	222 B	222 B	✓
Client pages/link Size	4.78 kB	4.78 kB	✓
Client pages/link gzip Size	2.09 kB	2.09 kB	✓
Client pages/routerDirect Size	411 B	411 B	✓
Client pages/routerDirect gzip Size	296 B	296 B	✓
Client pages/withRouter Size	393 B	393 B	✓
Client pages/withRouter gzip Size	280 B	280 B	✓
Client main Size	23.3 kB	23.3 kB	✓
Client main gzip Size	7.63 kB	7.63 kB	✓
Client commons Size	183 kB	183 kB	⚠️ +11 B
Client commons gzip Size	59.5 kB	59.5 kB	⚠️ +3 B
Client webpack Size	1.49 kB	1.49 kB	✓
Client webpack gzip Size	769 B	769 B	✓
Serverless pages/link Size	343 kB	343 kB	⚠️ +30 B
Serverless pages/link gzip Size	88.9 kB	88.9 kB	⚠️ +4 B
Serverless pages/index Size	334 kB	334 kB	⚠️ +30 B
Serverless pages/index gzip Size	86.5 kB	86.5 kB	⚠️ +3 B
Serverless pages/_error Size	335 kB	335 kB	⚠️ +30 B
Serverless pages/_error gzip Size	86.3 kB	86.3 kB	⚠️ +2 B
Serverless pages/routerDirect Size	334 kB	334 kB	⚠️ +30 B
Serverless pages/routerDirect gzip Size	86.5 kB	86.6 kB	⚠️ +3 B
Serverless pages/withRouter Size	335 kB	335 kB	⚠️ +30 B
Serverless pages/withRouter gzip Size	86.6 kB	86.7 kB	⚠️ +4 B
Build Dir Size	2.37 MB	2.37 MB	⚠️ +234 B