Fix typo which caused CdkHeaderRow to be used instead of CdkRow in MdTable row

[swftvsn]

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[swftvsn]

I signed it!

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CLAs look good, thanks!

[swftvsn]

@jelbourn This is only a minor typo fix, prolly faster to just change it and commit in. Anyway, testing the new table results now all rows to be underlined due to (atleast I suspect) this.

[andrewseguin]

Good catch, thanks for fixing that up. Little concerned that the tests didn't catch this.

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