Removes an unneeded var in mob_hud.dm #26980

Job	Run time
Lint with OpenDream	20s
Compile Maps	42s
Find Maps to Test	11s
Windows Build	3m 30s
Run Linters	4m 36s
Alternate Tests	0s
Check Alternate Tests	0s
Unit Tests (bigredv2) / run_unit_tests	2m 49s
Unit Tests (almayer) / run_unit_tests	2m 55s
Unit Tests (chinook) / run_unit_tests	3m 7s
Unit Tests (corsat) / run_unit_tests	2m 59s
Unit Tests (desert_dam) / run_unit_tests	2m 54s
Unit Tests (fiorina_sciannex) / run_unit_tests	2m 58s
Unit Tests (kutjevo) / run_unit_tests	3m 0s
Unit Tests (ice_colony_v2) / run_unit_tests	3m 5s
Unit Tests (lv522_chances_claim) / run_unit_tests	2m 53s
Unit Tests (new_varadero) / run_unit_tests	2m 53s
Unit Tests (lv624) / run_unit_tests	2m 47s
Unit Tests (prison_station_fop) / run_unit_tests	2m 47s
Unit Tests (runtime) / run_unit_tests	2m 48s
Unit Tests (shivas_snowball) / run_unit_tests	2m 51s
Unit Tests (sorokyne_strata) / run_unit_tests	2m 52s
Unit Tests (whiskey_outpost_v2) / run_unit_tests	2m 47s
	55m 44s

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