urlmon: Delete the static critical section when unloading the dll.

dlls/urlmon/urlmon_main.c

diff --git a/dlls/urlmon/urlmon_main.c b/dlls/urlmon/urlmon_main.c
index 0911127..cfd0918 100644
--- a/dlls/urlmon/urlmon_main.c
+++ b/dlls/urlmon/urlmon_main.c
@@ -154,6 +154,7 @@
 
     case DLL_PROCESS_DETACH:
         process_detach();
+        DeleteCriticalSection(&tls_cs);
         break;
 
     case DLL_THREAD_DETACH: