Fix regression with fullscreen titlebar text label #691
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Fixes the issue mentioned here: #689 (comment). Specifically, the area above the viewport is now filled with the window's default background color just like it was before, to ensure the fullscreen text label is readable. The other issue mentioned in the comment is partially not really our problem, I believe it's a glitch (in Qt?) likely caused by DPI scaling, and was present before albeit hardly noticeable due to the similarity of the default window background color and the menu bar color. Nonetheless, this fix restores the original painting behavior near the top and makes the issue hardly noticeable again.