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gtk4: fix ScrolledWindow constructor signature

Damien Radtke requested to merge dradtke/vala:gtk-scrolled-window-constructor into master

I recently ran into this compilation error:

../src/window.vala: In function ‘window_construct’:
../src/window.vala:15:32: error: too few arguments to function ‘gtk_scrolled_window_new’
   15 |   this.content_view = new Gtk.ScrolledWindow();
      |                                ^~~~~~~~~~~~~~~~       
In file included from /usr/include/gtk-4.0/gtk/gtk.h:191,
                 from lunchmoney.p/src/window.c:4:
/usr/include/gtk-4.0/gtk/gtkscrolledwindow.h:95:16: note: declared here
   95 | GtkWidget*     gtk_scrolled_window_new               (GtkAdjustment     *hadjustment,
      |                ^~~~~~~~~~~~~~~~~~~~~~~
ninja: build stopped: subcommand failed.

I believe the problem is just that the vapi for gtk4 does not match the signature of gtk_scrolled_window_now().

Full disclosure: I have not set up a full development environment for Vala yet, so this fix is not officially tested.

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