Do not initialize a URLPatternInit member to null in "initialize a URLPattern"

[jeremyroman]

It is not valid for the baseURL dictionary member to be null, only either absent or a USVString. Instead, this should be omitted from the dictionary altogether if no string was provided to this algorithm.

Any string which is invalid will fail later on, when it is to be parsed as a URL.

Fixes #204.

• At least two implementers are interested (and none opposed):
  • Google Chrome
  • n/a (change is simply fixing a bug in a non-controversial way, per this comment)
• Tests are written and can be reviewed and commented upon at:
  • n/a (this is a fix to how the spec expresses this, but does not represent a behavior change, and existing tests cover this behavior)
• Implementation bugs are filed:
  • Chromium: n/a (believed to work correctly in Chromium)
  • Gecko: https://bugzilla.mozilla.org/show_bug.cgi?id=1731418 (vendor does not yet implement the spec)
  • WebKit: [no known URLPattern bug] (vendor does not yet implement the spec)
  • Deno: n/a (no reason to believe a change is required)
  • kenchris/urlpattern-polyfill: n/a (no reason to believe a change is required)
• MDN issue is filed: n/a (change is on a spec detail not expressly documented)
• The top of this comment includes a clear commit message to use.

(See WHATWG Working Mode: Changes for more details.)

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