#1137 Title resets on display off

[Srijan Kumar]

While running the demo file (and I assume that it happens in the main file as well - I am not able to run it (see ticket #1136)), whenever the option that says "show title" (after right clicking on the graph and selecting "properties") is unchecked and saved, the previous title is reverted to "Title" and the font and the color selection are also reset. Since the option says "show title" and not "reset title", the inputed title should not be reset, it should just not be shown.