Fix typo in missing_provider_scope.dart #5769

Job	Run time
build (stable, examples/counter)	59s
build (stable, examples/marvel)	45s
build (stable, examples/pub)	43s
build (stable, examples/random_number)	43s
build (stable, examples/stackoverflow)	45s
build (stable, examples/todos)	58s
build (stable, packages/riverpod)	1m 39s
build (stable, packages/riverpod/example)	46s
build (stable, packages/flutter_riverpod)	1m 3s
build (stable, packages/flutter_riverpod/example)	52s
build (stable, packages/hooks_riverpod)	56s
build (stable, packages/hooks_riverpod/example)	51s
build (stable, packages/riverpod_annotation)	41s
build (stable, packages/riverpod_generator)	1m 16s
build (stable, packages/riverpod_generator/integration/build_yaml)	1m 12s
build (master, examples/counter)	1m 38s
build (master, examples/marvel)	1m 28s
build (master, examples/pub)	1m 24s
build (master, examples/random_number)	1m 21s
build (master, examples/stackoverflow)	1m 22s
build (master, examples/todos)	1m 36s
build (master, packages/riverpod)	2m 16s
build (master, packages/riverpod/example)	1m 14s
build (master, packages/flutter_riverpod)	1m 45s
build (master, packages/flutter_riverpod/example)	1m 29s
build (master, packages/hooks_riverpod)	1m 43s
build (master, packages/hooks_riverpod/example)	1m 27s
build (master, packages/riverpod_annotation)	1m 7s
build (master, packages/riverpod_generator)	1m 52s
build (master, packages/riverpod_generator/integration/build_yaml)	1m 43s
	37m 34s

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