[FIX] mail_tracking: error when filtering by "Sent"

[sugapablo]

Problem:

~/web#action=928&cids=1&menu_id=282&model=mail.tracking.email&view_type=list

Go to: Email Marketing -> Mail Tracking -> Emails
Click Filters and select "Sent"

Error:
Odoo Server Error

Traceback (most recent call last):
File "/opt/odoo13/odoo/odoo/http.py", line 624, in _handle_exception
return super(JsonRequest, self)._handle_exception(exception)
File "/opt/odoo13/odoo/odoo/http.py", line 310, in _handle_exception
raise pycompat.reraise(type(exception), exception, sys.exc_info()[2])
File "/opt/odoo13/odoo/odoo/tools/pycompat.py", line 14, in reraise
raise value
File "/opt/odoo13/odoo/odoo/http.py", line 669, in dispatch
result = self._call_function(**self.params)
File "/opt/odoo13/odoo/odoo/http.py", line 350, in _call_function
return checked_call(self.db, *args, **kwargs)
File "/opt/odoo13/odoo/odoo/service/model.py", line 94, in wrapper
return f(dbname, *args, **kwargs)
File "/opt/odoo13/odoo/odoo/http.py", line 339, in checked_call
result = self.endpoint(*a, **kw)
File "/opt/odoo13/odoo/odoo/http.py", line 915, in call
return self.method(*args, **kw)
File "/opt/odoo13/odoo/odoo/http.py", line 515, in response_wrap
response = f(*args, **kw)
File "/opt/odoo13/odoo/addons/web/controllers/main.py", line 1300, in search_read
return self.do_search_read(model, fields, offset, limit, domain, sort)
File "/opt/odoo13/odoo/addons/web/controllers/main.py", line 1319, in do_search_read
return Model.web_search_read(domain, fields, offset=offset, limit=limit, order=sort)
File "/opt/odoo13/odoo/addons/web/models/models.py", line 48, in web_search_read
records = self.search_read(domain, fields, offset=offset, limit=limit, order=order)
File "/opt/odoo13/odoo/odoo/models.py", line 4960, in search_read
records = self.search(domain or [], offset=offset, limit=limit, order=order)
File "/opt/odoo13/odoo/odoo/models.py", line 1657, in search
res = self._search(args, offset=offset, limit=limit, order=order, count=count)
File "/opt/odoo13/odoo/odoo/models.py", line 4505, in _search
query = self._where_calc(args)
File "/opt/odoo13/odoo/odoo/models.py", line 4227, in _where_calc
where_clause, where_params = e.to_sql()
File "/opt/odoo13/odoo/odoo/osv/expression.py", line 1296, in to_sql
q, ps = self.__leaf_to_sql(leaf)
File "/opt/odoo13/odoo/odoo/osv/expression.py", line 1238, in __leaf_to_sql
raise ValueError("Invalid domain term %r" % (leaf,))
ValueError: Invalid domain term ('state', 'in', 'sent')

Solution:
Minor edit to: mail.tracking.email.search

[oca-clabot]

Hey @sugapablo, thank you for your Pull Request.

It looks like some users haven't signed our Contributor License Agreement, yet.
You can read and sign our full Contributor License Agreement here: http://odoo-community.org/page/cla
Here is a list of the users:

• @sugapablo (login unknown in OCA database)

Appreciation of efforts,
OCA CLAbot

[sugapablo]

@oca-clabot emailed agreement to you

[rafaelbn]

/ocabot merge patch

[OCA-git-bot]

What a great day to merge this nice PR. Let's do it!
Prepared branch 13.0-ocabot-merge-pr-847-by-rafaelbn-bump-patch, awaiting test results.

[OCA-git-bot]

Congratulations, your PR was merged at 9b4eb4c. Thanks a lot for contributing to OCA. ❤️