Incorrect wildcard certificate parsing during creation

The "create ACME certificate" process incorrectly parses wildcard certificates and refuses to validate.

Steps to reproduce:

1. Create a new CSR under the "OpenVPN Server Certificate" profile. Select "*.mydomain.com" as your SAN, and leave CN blank
2. Attempt to "Create ACME Certificate"
3. Fill in name, agree to TOS, select authenticator, submit
4. See error.

FAILED
[EINVAL] acme_create.dns_mapping: Wildcards must be at the start of domain name followed by a period 

The full error trace is as follows:

Error: Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/middlewared/job.py", line 367, in run
    await self.future
  File "/usr/local/lib/python3.9/site-packages/middlewared/job.py", line 403, in __run_body
    rv = await self.method(*([self] + args))
  File "/usr/local/lib/python3.9/site-packages/middlewared/schema.py", line 975, in nf
    return await f(*args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/middlewared/plugins/crypto.py", line 1709, in do_create
    data = await self.middleware.run_in_thread(
  File "/usr/local/lib/python3.9/site-packages/middlewared/utils/run_in_thread.py", line 10, in run_in_thread
    return await self.loop.run_in_executor(self.run_in_thread_executor, functools.partial(method, *args, **kwargs))
  File "/usr/local/lib/python3.9/concurrent/futures/thread.py", line 52, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/usr/local/lib/python3.9/site-packages/middlewared/schema.py", line 979, in nf
    return f(*args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/middlewared/plugins/crypto.py", line 1757, in __create_acme_certificate
    final_order = self.acme_issue_certificate(job, 25, data, csr_data)
  File "/usr/local/lib/python3.9/site-packages/middlewared/plugins/crypto.py", line 1387, in acme_issue_certificate
    raise verrors
middlewared.service_exception.ValidationErrors: [EINVAL] acme_create.dns_mapping: Wildcards must be at the start of domain name followed by a period