Fixed bug with caption not showing for some apps that handle config changes

We currently decide when to show the decor caption onConfigurationChanged
However, if the app handles configuration changes or the threshold isn't
big enough for the configuration change to be reported to the app, we don't
display the caption in some cases when transitioning from fullscreen mode
to freeform mode.
We now also use the onMultiWindowModeChanged call to also determine if
the caption should be visible.

Change-Id: I237437f04ad90f904912ebac0253245f547b0e3e