Fix for bug 17493, We need to cleanup any GCI commands from the URI when generating a file name. R=rhp

mailnews/compose/src/nsMsgCompUtils.cpp

@@ -1924,6 +1924,7 @@ GenerateFileNameFromURI(nsIURI *aURL)
     if (*cp)
     {
       if ((cp1 = PL_strchr(cp, '/'))) *cp1 = 0;  
+      if ((cp1 = PL_strchr(cp, '?'))) *cp1 = 0;  
       if (*cp != '\0')
       {
         returnString = PL_strdup(cp);