fix(nav-schematics): update isHandset$ type and fix template expression

[chrisvfabio]

Fixes #11445
Fixes #11441

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[chrisvfabio]

I signed it!

[googlebot]

CLAs look good, thanks!

[crisbeto]

LGTM

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[ghost]

Excellent - when do we expect this fix to be available for use? I see it has been merged with master but the version that comes down when ng g @angular/material:material-nav is called still has the issues.

[iDevelopenhou]

Great thanks a lot man saved my day!

[ondrejpar]

The fix works, however the generated spec still fails, with the following error: 2 timer(s) still in the queue. (Dunno - should I open a new issue or is it related to this one?)

[amcdnl]

LGTM

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