We currently load the expert indicator resources using an <img> tag.
According to QTBUG-36383 the @2x versions won't load unless you've built
with Qt 5.4.0 or later.
Change-Id: I003fd5d5f10e779f2e7ca6ba9fbb8e033df85b80
Reviewed-on: https://code.wireshark.org/review/7601
Reviewed-by: Gerald Combs <gerald@wireshark.org>