Table: shouldUpdateHeight should be true when maxHeight is set

[Leopoldthecoder]

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@furybean
Fixes #10009

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[hilanmiao]

but，it‘s not work in my project。element-ui version 2.2.2，vue version 2.5.16

[goforward01]

Hi, @Leopoldthecoder, Just like @hilanmiao said, it doesn't work for me either. I didn't set max-height but I set height of table to a number. the version of element-ui is 2.2.2 too. Sorry about I can't give a online demo for I couldn't visit jsFiddle(FGW). The shouldUpdateHeight doesn't change while the height of table or the body wrapper of table should be updated. May you take a look about this when you have time, thanks.