AppletQuickItem: Do not remember the popup dialog size

Review Request #118849 - Created June 20, 2014 and submitted - Latest diff uploaded

Vishesh Handa
    The popup dialog can currently never be resized, so it doesn't make
    sense to record its height in a config file. Additionally, this also
    causes problems when applet writers change the size of their plasmoid.
    Since the old size is saved in the config file, it is shown with the old
    dimensions instead of the new ones.

When we implement dialog resizing at that time we can propogate a signal which says that the applet has been manually resized and save it in a config file. Though even that could be buggy since the plasmoid could later be much smaller.