fix(sample): fix buildConfigField #385

Job	Run time
Build job	6m 5s
Run lint on project	4m 26s
Run common tests on Firebase	4m 28s
Create release bundle	4m 54s
Run emarsys tests on Firebase	3m 52s
Run core tests on Firebase	3m 52s
Run emarsys-firebase tests on Firebase	3m 53s
Run emarsys-huawei tests on Firebase	4m 29s
Run emarsys-sdk tests on Firebase	4m 17s
Run mobile-engage tests on Firebase	4m 31s
Run predict tests on Firebase	4m 12s
Release sample app	0s
Send slack on error	5s
Send slack notification	0s
	49m 4s

Provide feedback