Add NASAMs to MERAD unit list for campaign template (#3406) (#3410)

Adds NASAM launcher B and C to the list of units that can be placed in a
campaign template to define a MERAD spawn location.

This is needed to maintain compatibility with the new versions of my
campaigns.

Pull requests should be made against the `develop` branch. Any backports
necessary will be handled by the development team.

Pull requests should be focused on one task. Multiple bug fixes should
be
multiple PRs. We cannot merge half a PR, and combined PRs are much more
difficult to review. PRs that do not adhere to this will have their
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Prefer rebase to merge, and squash commits as needed to preserve a
readable
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we will either rebase or squash your PR when merging. It is much easier
for us
if your branch already has a readable commit history (ensure that your
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subject lines are clear enough to identify the patch in the git log). An
exception to this is made for large PRs that are likely to require
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new changes if a branch is force pushed) and we will squash it when
merging.

New features and bug fixes are usually worth mentioning in the
changelog.
Exceptions are fixes for bugs that never shipped (were only present in a
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upcoming
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Co-authored-by: Starfire13 <72491792+Starfire13@users.noreply.github.com>

game/campaignloader/mizcampaignloader.py

@@ -61,6 +61,8 @@ class MizCampaignLoader:
         AirDefence.Hawk_ln.id,
         AirDefence.S_75M_Volhov.id,
         AirDefence.X_5p73_s_125_ln.id,
+        AirDefence.NASAMS_LN_B.id,
+        AirDefence.NASAMS_LN_C.id,
     }
 
     SHORT_RANGE_SAM_UNIT_TYPES = {