Remove macos-specific test to verify that -I is not supported, since that seems to...

Remove macos-specific test to verify that -I is not supported, since that seems to work now.

Failed test:

```
#   Failed test 'exit_is_num: fping -I lo0 127.0.0.1, 3'
#   at ci/test-07-options-i-m.pl line 63.
#          got: 0
#     expected: 3

#   Failed test 'stdout_is_eq: fping -I lo0 127.0.0.1, fping: cant bind to a particular net interface since SO_BINDTODEVICE is not supported on your os.
# '
#   at ci/test-07-options-i-m.pl line 64.
#          got: '127.0.0.1 is alive
# '
#     expected: 'fping: cant bind to a particular net interface since SO_BINDTODEVICE is not supported on your os.
# '
# Looks like you failed 2 tests of 28.
```