opsgenie_teams with 'opsgenie_teams_args' overwrites the configured value once it's parsed

[lstyles]

Similar to a situation described in this discussion: #534 the following line of code: https://github.com/jertel/elastalert2/blob/master/elastalert/alerters/opsgenie.py#L72 parses args, and then overwrites self.teams. Next time the alert triggers, args are no longer parsed and instead, the result of first parsing is used.

For example, the following rule config:

opsgenie_teams: 
-  \"2nd Line Support\"
- \"{owning_team}\"
opsgenie_teams_args:
  owning_team: owning_team

will mean that the first alert will correctly evaluate the owning team from a field in the match (let's say Infrastructure), but each subsequent alert execution will have the self.teams set to:

• 2nd Line Support
• Infrastructure

and will no longer be evaluated

I think the following fixes it:
https://github.com/jertel/elastalert2/pull/1539/files

There's potentially a similar issue with recipients.

[lstyles]

fixed in #1539