Fix: a repeated typo in multiple test files of the FirebaseStorage #5639

Job	Run time
spm-package-resolved	58s
storage-integration-tests (Swift)	3m 10s
quickstart (swift, macos-14, Xcode_15.3)	1m 34s
storage-integration-tests (ObjC)	3m 12s
pod-lib-lint (ios, macos-14)	10m 7s
pod-lib-lint (tvos, macos-14)	9m 6s
quickstart-ftl-cron-only	0s
pod-lib-lint (macos, macos-14)	4m 43s
pod-lib-lint (watchos, macos-14)	2m 47s
spm (iOS, macos-14, Xcode_15.2)	7m 4s
spm (iOS, macos-14, Xcode_16)	11m 1s
spm (tvOS, macos-14, Xcode_15.2)	3m 15s
spm (tvOS, macos-14, Xcode_16)	4m 8s
spm (macOS, macos-14, Xcode_15.2)	3m 13s
spm (macOS, macos-14, Xcode_16)	3m 24s
spm (catalyst, macos-14, Xcode_15.2)	3m 13s
spm (catalyst, macos-14, Xcode_16)	5m 31s
spm (watchOS, macos-14, Xcode_15.2)	4m 27s
spm (watchOS, macos-14, Xcode_16)	4m 53s
storage-cron-only	0s
	1h 25m 46s

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