fix linter warnings because of icon index operations (#1109) #4419

Job	Run time
Start Gate	1s
Collect data and setup caches for other tasks	19s
Run Linters	3m 17s
Compile Maps	2m 55s
Windows Build	1m 56s
Integration Tests / run (birdshot) / Run Tests (birdshot; 515)	12m 35s
Integration Tests / run (deltastation) / Run Tests (deltastation; 515)	11m 53s
Integration Tests / run (cyberiad) / Run Tests (cyberiad; 515)	13m 24s
Integration Tests / run (gateway_test) / Run Tests (gateway_test; 515)	12m 33s
Integration Tests / run (icebox) / Run Tests (icebox; 515)	10m 42s
Integration Tests / run (metastation) / Run Tests (metastation; 515)	11m 28s
Integration Tests / run (multiz_debug) / Run Tests (multiz_debug; 515)	11m 11s
Integration Tests / run (runtimestation) / Run Tests (runtimestation; 515)	10m 13s
Integration Tests / run (nebulastation) / Run Tests (nebulastation; 515)	12m 39s
Integration Tests / run (tramstation) / Run Tests (tramstation; 515)	12m 18s
Integration Tests / run (wawastation) / Run Tests (wawastation; 515)	12m 30s
Alternate Tests / run (515, 1642, runtimestation) / Run Tests (515.1642; runtimestation; 515)	10m 2s
Alternate Tests / run (516, 1648, runtimestation, 516) / Run Tests (516.1648; runtimestation; 516)	10m 21s
Compare Screenshot Tests	21s
Completion Gate	1s
	2h 40m 39s

Provide feedback