Location bar height won't be rescaled on display change

[Chris Coulson]

https://git.launchpad.net/oxide/diff/qt/core/browser/oxide_qt_web_view.cc?id=a32c044a2d75e4d14b1d01f271a3dc066a35a448 changes how the location bar height is rescaled when the device scale changes. Previously, it would be rescaled if the scale of the display changed or if a view moved between displays. Now it will only rescale if the scale of the display changes, meaning there is a clear chance of a regression here.