Fix actor generation template #2410

Job	Run time
test-fast (tests/Proto.Actor.Tests/*.csproj)	1m 52s
build	2m 42s
test-slow (net7.0, tests/Proto.Cluster.Tests/*.csproj)	7m 46s
test-slow (net7.0, tests/Proto.Cluster.PartitionIdentity.Tests/*.csproj)	2m 55s
test-fast (tests/Proto.Remote.Tests/*.csproj)	1m 9s
test-slow (net7.0, tests/Proto.Cluster.RedisIdentity.Tests/*.csproj)	2m 53s
test-fast (tests/Proto.OpenTelemetry.Tests/*.csproj)	1m 10s
test-slow (net7.0, tests/Proto.Cluster.PubSub.Tests/*.csproj)	3m 22s
test-fast (tests/Proto.Cluster.CodeGen.Tests/*.csproj)	55s
test-slow (net6.0, tests/Proto.Cluster.Tests/*.csproj)	7m 47s
test-slow (net6.0, tests/Proto.Cluster.PartitionIdentity.Tests/*.csproj)	2m 42s
test-slow (net6.0, tests/Proto.Cluster.RedisIdentity.Tests/*.csproj)	2m 53s
test-slow (net6.0, tests/Proto.Cluster.PubSub.Tests/*.csproj)	3m 29s
	41m 35s

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