Fix weapons with fire rate modifiers getting stuck waiting for energy drain

[lL1l1]

Issue

Weapons with too high fire rate bonus can get stuck waiting for their energy drain because the fire rate isn't considered in the drain/s of the economy event.
This issue arose in the past with the Salvation. It was fixed previously by increasing the drain in the blueprint, but I found it again in a mod because mods use old blueprints to override everything.

Description of the proposed changes

Increase energy drain/s proportional to fire rate changes.

Testing done on the proposed changes

Spawn a UEF T3 artillery and 9 adjacent T3 pgens (use spawn menu's unit count selection to stack them). It should fire when the work progress bar is full instead of pausing for a few seconds (I assume that's a target check interval).

Checklist

• Changes are annotated, including comments where useful
• Changes are documented in a changelog snippet according to the guidelines.
• Request 2-3 reviewers from the list of reviewers and their areas of knowledge.

[Basilisk3]

Tested and works.