comdlg32: Fix a typo

[Andrew Talbot]

Changelog:
    comdlg32: Fix a typo.

diff --git a/dlls/comdlg32/printdlg.c b/dlls/comdlg32/printdlg.c
index 318c82b..b7d9f92 100644
--- a/dlls/comdlg32/printdlg.c
+++ b/dlls/comdlg32/printdlg.c
@@ -3413,8 +3413,8 @@ PRINTDLG_PagePaintProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 static LRESULT CALLBACK pagesetup_margin_editproc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
 {
     switch(msg)
-    case WM_CHAR:
     {
+    case WM_CHAR:
         WCHAR decimal = get_decimal_sep();
         WCHAR wc = (WCHAR)wparam;
         if(!isdigitW(wc) && wc != decimal && wc != VK_BACK) return 0;