Unicode port: fixing special NSIS escape characters in strings. No change in exehead size.

git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@6055 212acab6-be3b-0410-9dea-997c60f758d6

Source/exehead/Main.c

@@ -159,7 +159,7 @@ int WINAPI _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInst,LPTSTR lpszCmdPara
 
       if (CMP4CHAR(cmdline-2, _T(" /D=")))
       {
-        *(LPDWORD)(cmdline-2)=0; // keep this from being passed to uninstaller if necessary
+        *(cmdline-2)=_T('\0'); // keep this from being passed to uninstaller if necessary
         mystrcpy(state_install_directory,cmdline+2);
         break; // /D= must always be last
       }