Fix bug when resizing the window

Note that sometimes when the windows is resized, a gap forms between to border and the bottom. Further investigation reveals that the gap occurs when one field is larger than an adjacent field within the same row.

The best way (that I could think of) to fix this is through jQuery. So by adding a few lines of code to gridforms.js, each and every field resizes to be the height of the largest field within a row.