OZG-6944 fix constant name

src/main/java/de/ozgcloud/nachrichten/postfach/muk/MukPostfachConfiguration.java

@@ -15,13 +15,13 @@ public class MukPostfachConfiguration {
 
 	public static final String OZG_CLOUD_FILE_SERVICE_NAME = "mukPostfach_OzgCloudFileService";
 
-	public static final String GRPC_FILE_MANAGER_FILE = "file-manager";
+	public static final String GRPC_FILE_MANAGER_NAME = "file-manager";
 
 	public static final String MUK_POSTFACH_CLIENT_NAME = "OzgCloud_MukPostfach";
 
-	@GrpcClient(GRPC_FILE_MANAGER_FILE)
+	@GrpcClient(GRPC_FILE_MANAGER_NAME)
 	private BinaryFileServiceBlockingStub fileServiceBlockingStub;
-	@GrpcClient(GRPC_FILE_MANAGER_FILE)
+	@GrpcClient(GRPC_FILE_MANAGER_NAME)
 	private BinaryFileServiceStub fileServiceAsyncServiceStub;
 
 	@Bean(OZG_CLOUD_FILE_SERVICE_NAME) // NOSONAR