fix(material-experimental/mdc-form-field): fix height for form field …

[annieyw]

…with textarea

Before:

After:

Autosize <textarea> inputs and one line <textarea> inputs should default to the same height as <input> inputs

Line-height can sometimes cause containers to be slightly taller than their content so setting it to 0 prevents that.

[mmalerba]

LGTM

[crisbeto]

LGTM

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