FrameSvg: Don't reset the cache when resizing

We were passing the enum as the first argument, which was being
converted to 0 and would set lastModified to 0. This would in turn
result in the cache being bypassed because now `findInCache with a
lastModified timestamp of 0 is deprecated` taking the slow path on most
occasions.

src/plasma/framesvg.cpp

@@ -179,7 +179,7 @@ void FrameSvg::resizeFrame(const QSizeF &size)
     d->pendingFrameSize = size.toSize();
 
     if (!d->repaintBlocked) {
-        d->updateFrameData(FrameSvgPrivate::UpdateFrame);
+        d->updateFrameData(Svg::d->lastModified, FrameSvgPrivate::UpdateFrame);
     }
 }