Adjust the window frame when setTitleBarHeight is called.
Adjust the window frame when setTitleBarHeight is called.

This has the effect that the content view of the window is not resized
when changing the height of the title bar, which is consistent with how
NSToolbars in the title bar work when changing their visibility and
size.

sdesimone/INAppStoreWindow,appden/INAppStoreWindow,indragiek/INAppStoreWindow,cparnot/INAppStoreWindow,indragiek/INAppStoreWindow,cparnot/INAppStoreWindow,appden/INAppStoreWindow,xvtom/INAppStoreWindow,xvtom/INAppStoreWindow,sdesimone/INAppStoreWindow