[libfuzzer] Fix dictionary for net_websocket_extension_parser_fuzzer.

libFuzzer doesn't accept "\t", use "\x09" instead.

BUG=

TBR=ricea@chromium.org,eroman@chromium.org

Review-Url: https://codereview.chromium.org/2339913002
Cr-Commit-Position: refs/heads/master@{#418564}

net/data/fuzzer_dictionaries/net_websocket_extension_parser_fuzzer.dict

@@ -10,7 +10,7 @@
 "\x0A"
 "\x00"
 "\\"
-"()<>@,;:\\\"/[]?={} \t"
+"()<>@,;:\\\"/[]?={} \x09"
 "permessage-deflate"
 "server_no_context_takeover"
 "client_no_context_takeover"