fix, icon styles affecting invalid clickable layer
fix, icon styles affecting invalid clickable layer

styles for svg icons were leaking and affecting paths inside the
canvas. this fix makes the icon styles a bit more specific so that they
have to show up within an <i> tag to work

dwwoelfel/precursor,PrecursorApp/precursor,dwwoelfel/precursor,dwwoelfel/precursor,PrecursorApp/precursor,PrecursorApp/precursor