Print thread ids in traces with only 4 digits now that they are small
integers.

diff --git a/windows/spy.c b/windows/spy.c
index 5e70d45..f17afb6 100644
--- a/windows/spy.c
+++ b/windows/spy.c
@@ -2284,7 +2284,7 @@
             DWORD tid = GetWindowThreadProcessId( hWnd, NULL );
 
             if (tid == GetCurrentThreadId()) strcpy( taskName, "self" );
-            else sprintf( taskName, "tid %08lx", GetCurrentThreadId() );
+            else sprintf( taskName, "tid %04lx", GetCurrentThreadId() );
 
             if (iFlag == SPY_SENDMESSAGE16)
                 TRACE("%*s(%04x) %-16s message [%04x] %s sent from %s wp=%04x lp=%08lx\n",