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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