[bug 906273] increase height of label wrapper to avoid clipping Arabic-script text

This enables us to display Arabic-script labels without clipping and without disrupting the baseline position of the label text; the margin adjustments are to maintain the existing position of the text in relation to the icon, while its display box is enlarged to allow for taller glyphs to be drawn.
Merge branch 'patch-3' of https://github.com/jfkthame/gaia into patch-3