I would say it depends on whether or not entering that line would make a difference on your return. Line 19 on the W-2 is local income tax withheld; this may be deductible as a SALT (State And Local Tax) on Schedule A.
However, between the increase in the Standard Deduction and the $10,000 cap on SALT, it is quite likely that adding this local tax wouldn't make any difference in your return. Indeed, I can't see how adding this entry would increase your tax, but would likely decrease it if anything.
I doubt anyone will complain if you just sit on this and see if any one notices. There is no point in amending if it doesn't make any difference.
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