Use proper gunner in roadblocks and not militia

[wersal454]

What type of PR is this?

• Bug
• Change
• Feature
• Miscellaneous

Sub-categories:

• Template
• Map
• Config
• Function
• Localization

What have you changed, and why?

Information:

Title

Don't use militia gunner when you can use either police unit or tiered unit.

How can your changes be tested, or reproduced?

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Does this PR include changes not authored by you?

• No
• Yes (See below)

Further info:

• I confirm that I, and by extension this repository, can legally use these third-party changes. (Provide links or author attribution.)

...

Please verify the following (If possible).

* - Mandatory

• These changes are my own, or I have written permission to use them. *
• These changes are ready for review, or will be marked as a draft. *
• I have loaded the mission in LAN host.
• I have loaded the mission on a dedicated server.

Is further work needed?

• Needs further testing.
• Needs further changes.
• Needs to be converted to a draft.

Please specify which Issue this PR Resolves (If Applicable).

This PR closes #XYZ.

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Notes:

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[wersal454]

@Silence-112