[MIRROR] Fixes boulder processing mining point gain. (#595)

* Fixes boulder processing mining point gain. (#81067)

## About The Pull Request

Due to a misplaced multiplier, arcmining machines were eating their own
point totals.
Now, the refinery and smelter should correctly only take the
MINING_POINT_MACHINE_MULTIPLIER define on the amount being added to the
points held, not on the total resting in the machine.

## Why It's Good For The Game

Simple, easy fix.
Fixes #81057.

## Changelog

:cl:
fix: The smelter and refinery now properly hold mining points, only
taking a small amount out of net gained points.
/:cl:

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Co-authored-by: SyncIt21 <[email protected]>

* Fixes boulder processing mining point gain.

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Co-authored-by: ArcaneMusic <[email protected]>
Co-authored-by: SyncIt21 <[email protected]>

code/modules/mining/boulder_processing/_boulder_processing.dm

@@ -211,7 +211,7 @@
 		if(!is_type_in_list(possible_mat, processable_materials))
 			continue
 		var/quantity = chosen_boulder.custom_materials[possible_mat]
-		points_held = round((points_held + (quantity * possible_mat.points_per_unit)) * MINING_POINT_MACHINE_MULTIPLIER) // put point total here into machine
+		points_held = round(points_held + (quantity * possible_mat.points_per_unit * MINING_POINT_MACHINE_MULTIPLIER)) // put point total here into machine
 		processable_ores += possible_mat
 		processable_ores[possible_mat] = quantity
 		chosen_boulder.custom_materials -= possible_mat //Remove it from the boulder now that it's tracked