Fixes milk runtime in on_mob_life() (and maybe other reagents) #20265

Job	Run time
Compile Maps	1m 3s
Lint with OpenDream	1m 57s
Find Maps to Test	10s
Run Linters	2m 7s
Windows Build	1m 49s
Unit Tests (chinook) / run_unit_tests	5m 50s
Unit Tests (bigredv2) / run_unit_tests	6m 1s
Unit Tests (almayer) / run_unit_tests	5m 52s
Unit Tests (corsat) / run_unit_tests	5m 55s
Unit Tests (fiorina_sciannex) / run_unit_tests	6m 2s
Unit Tests (desert_dam) / run_unit_tests	5m 50s
Unit Tests (ice_colony_v2) / run_unit_tests	5m 55s
Unit Tests (kutjevo) / run_unit_tests	5m 55s
Unit Tests (lv522_chances_claim) / run_unit_tests	5m 50s
Unit Tests (lv624) / run_unit_tests	5m 45s
Unit Tests (new_varadero) / run_unit_tests	5m 55s
Unit Tests (prison_station_fop) / run_unit_tests	5m 49s
Unit Tests (runtime) / run_unit_tests	5m 45s
Unit Tests (shivas_snowball) / run_unit_tests	5m 49s
Unit Tests (sorokyne_strata) / run_unit_tests	5m 48s
Unit Tests (whiskey_outpost_v2) / run_unit_tests	5m 46s
Alternate Tests (515, 1610, lv624) / run_unit_tests	5m 55s
Check Alternate Tests	1s
	1h 46m 49s

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