Firestore: Remove unnecessary brace initialization in call to AlphaNum #8373

Job	Run time
Check changed files	0s
pod-lib-lint-abtesting (iOS)	9m 17s
pod-lib-lint-auth (iOS)	18m 30s
pod-lib-lint-database (iOS)	14m 38s
pod-lib-lint-dynamiclinks (iOS)	6m 24s
pod-lib-lint-firestore (iOS)	39m 5s
pod-lib-lint-functions (iOS)	4m 29s
pod-lib-lint-inappmessaging (iOS)	12m 7s
pod-lib-lint-messaging (iOS)	7m 57s
pod-lib-lint-performance (iOS)	13m 15s
pod-lib-lint-remoteconfig (iOS)	10m 33s
pod-lib-lint-storage (iOS)	8m 0s
create_report	7m 53s
	2h 32m 8s

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