Palette configuration window is now centered.

src/drivers/win/palette.cpp

@@ -1,6 +1,7 @@
 #include "common.h"
 #include "main.h"
 #include "window.h"
+#include "gui.h"
 
 /**
 * Prompts the user for a palette file and opens that file.
@@ -72,6 +73,8 @@ BOOL CALLBACK PaletteConCallB(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lPa
 
 			EnableWindow(GetDlgItem(hwndDlg, 201), (eoptions & EO_CPALETTE) ? 1 : 0);
 
+			CenterWindowOnScreen(hwndDlg);
+
 			break;
 
 		case WM_HSCROLL: