refactor(@schematics/update): missing space in usageMessage output

[Splaktar]

Previously:

 Name Version Command to update ------------------------------------------------------------------------------------------------ @angular/cli 9.0.0-next.5 -> 9.0.0-next.8ng update @angular/cli --next 

After:

 Name Version Command to update ------------------------------------------------------------------------------------------------ @angular/cli 9.0.0-next.5 -> 9.0.0-next.8 ng update @angular/cli --next 

And it still looks fine with non-next versions

 Name Version Command to update ------------------------------------------------------------------------------------------------ @angular/cli 8.0.0 -> 8.3.8 ng update @angular/cli 

Fixes #15784

[alan-agius4]

Thanks LGTM

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