[whatwg] Date or Time String with Just a Time

[Smylers]

A valid time string, such as "10:55", is one of the possible values for
a valid date or time string:

  http://www.whatwg.org/html5#vaguer-moments-in-time

But step 10 of the parsing rules says:

  If the 'time present' flag is true, but 'position' is beyond the end
  of 'input', then fail.

That would appear to fail on "10:55".  I think making step 10 begin "If
the 'date present' and 'time present' flags are both true" (as step 11
already does) fixes this.

Smylers