[Bug 66262] Human login screen doesn't specify a font size for the input field

[Simon Law]

Public bug reported:

The Human login screen just relies on the default font size for the
input field.  Since the dimensions of that field are constrained, it may
appear to be too small to contain the text.

The attached patch adds a specific size.

** Affects: edgy-gdm-themes (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

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Human login screen doesn't specify a font size for the input field
https://launchpad.net/bugs/66262