src/arctica-greeter.vala: fix tiny main window on startup.

3a5ca24831d1b4a74af6cfd5c5cc2a42b5787aeb backported a commit calculating
the really needed screen size more correctly as a prerequisite for
additional multi-display support (span and zoom modes) from Slick
Greeter (5d39cade1f70ffe0a9bc38ad0b405bb55d98a505), but unfortunately
missed crucial code in src/arctica-greeter.vala.

While the realize call on main_window should be harmless, calling
setup_window on it actually leads to the main window resizing to the
actual size that was queried via GDK.

While setup_window is being called as part of the main window creation,
the first call just skips resizing it (for some reason). Subsequent
calls, which are *mostly* triggered through changes in the actual
display configuration (hardware or software), then have main window
recalculate its size (and updating the background).

Honestly, we could just rip out the whole do_resize logic and always
resize, since with these changes, we're forcing a resize on startup
anyway. Not doing so leads to the nasty bug this commit fixes.

However, to keep Slick Greeter's and our code more in sync (to make
future backporting easier), let's keep it like this for now.

Fixes: https://github.com/ArcticaProject/arctica-greeter/issues/47

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