Remove gwiddle.co.uk

[BenjaminEHowe]

I am not the original submitter, however it appears that the domain gwiddle.co.uk is now held by a malicious actor. Accordingly, I think it's better to remove this entry than for it to remain. The Gwiddle Foundation has been removed from the UK's charity register and no longer exists.

The tests are passing:

PASS: libpsl_icu_fuzzer
PASS: libpsl_icu_load_dafsa_fuzzer
PASS: libpsl_icu_load_fuzzer
============================================================================
Testsuite summary for libpsl 0.21.1
============================================================================
# TOTAL: 3
# PASS:  3
# SKIP:  0
# XFAIL: 0
# FAIL:  0
# XPASS: 0
# ERROR: 0
============================================================================
[...]
============================================================================
Testsuite summary for libpsl 0.21.1
============================================================================
# TOTAL: 5
# PASS:  5
# SKIP:  0
# XFAIL: 0
# FAIL:  0
# XPASS: 0
# ERROR: 0
============================================================================

See also #1637.

[dnsguru]

Validated this request. Will revert removal if contacted with request, but want to ensure no internet users are harmed, which is a priority.