ShellPkg: Fix ARM build errors.

submitted-by: Olivier Martin olivier.martin@arm.com>
reviewed-by: Jaben Carsey <Jaben.Carsey@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14400 6f19259b-4bc3-4df7-8a09-765794883524

ShellPkg/Library/UefiShellDebug1CommandsLib/EditTitleBar.c

@@ -107,6 +107,7 @@ MainTitleBarRefresh (
   // backup the old screen attributes
   //
   Orig.Data             = gST->ConOut->Mode->Attribute;
+  New.Data              = 0;
   New.Colors.Foreground = Orig.Colors.Background;
   New.Colors.Background = Orig.Colors.Foreground;