winedbg: if the crash dialog is disabled, don't show the invalid parameters dialog

[Austin English]

Quite annoying, especially if I explicitly asked not to be shown such
dialogs :).

-- 
-Austin
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diff --git a/programs/winedbg/tgt_active.c b/programs/winedbg/tgt_active.c
index 376ee22..d082d2a 100644
--- a/programs/winedbg/tgt_active.c
+++ b/programs/winedbg/tgt_active.c
@@ -763,7 +763,9 @@ enum dbg_start dbg_active_auto(int argc, char* argv[])
         argc--; argv++;
         ds = dbg_active_attach(argc, argv);
         if (ds != start_ok) {
-            msgbox_res_id(NULL, IDS_INVALID_PARAMS, IDS_AUTO_CAPTION, MB_OK);
+            if (DBG_IVAR(ShowCrashDialog)) {
+                msgbox_res_id(NULL, IDS_INVALID_PARAMS, IDS_AUTO_CAPTION, MB_OK);
+            }
             return ds;
         }
         if (!display_crash_dialog()) {