only enable GUI always on top, if we have fullscreen by default (#1351)

We don't want the GUI to be always on top in Windowed mode also

src/osdep/amiberry.cpp

@@ -2155,7 +2155,7 @@ void target_default_options(struct uae_prefs* p, int type)
 		//p->notaskbarbutton = false;
 		//p->nonotificationicon = false;
 		p->main_alwaysontop = false;
-		p->gui_alwaysontop = true;
+		p->gui_alwaysontop = false;
 		//p->guikey = -1;
 		p->automount_removable = false;
 		//p->automount_drives = 0;
@@ -2234,6 +2234,7 @@ void target_default_options(struct uae_prefs* p, int type)
 	{
 		p->gfx_apmode[0].gfx_fullscreen = amiberry_options.default_fullscreen_mode;
 		p->gfx_apmode[1].gfx_fullscreen = amiberry_options.default_fullscreen_mode;
+		p->gui_alwaysontop = true;
 	}
 	else
 	{