tools: Use correct key key when deleting item from map

The correct key to use is "tig" instead of "pid".

Signed-off-by: Mauricio Vásquez <mauricio@kinvolk.io>
diff --git a/tools/tcpconnect.py b/tools/tcpconnect.py
index 8cb6e4d..7c2cea1 100755
--- a/tools/tcpconnect.py
+++ b/tools/tcpconnect.py
@@ -241,7 +241,7 @@
     dports = [int(dport) for dport in args.port.split(',')]
     dports_if = ' && '.join(['dport != %d' % ntohs(dport) for dport in dports])
     bpf_text = bpf_text.replace('FILTER_PORT',
-        'if (%s) { currsock.delete(&pid); return 0; }' % dports_if)
+        'if (%s) { currsock.delete(&tid); return 0; }' % dports_if)
 if args.uid:
     bpf_text = bpf_text.replace('FILTER_UID',
         'if (uid != %s) { return 0; }' % args.uid)