network: Fix argument glitch (#5969)
network: Fix argument glitch (#5969)

Otherwise, the following error is occurred:

```log
/Users/cosmo/GitHub/fluent-bit/src/flb_network.c:1632:14: error: conflicting types for 'flb_net_server_unix'
flb_sockfd_t flb_net_server_unix(const char *listen_path)
             ^
/Users/cosmo/GitHub/fluent-bit/include/fluent-bit/flb_network.h:162:14: note: previous declaration is here
flb_sockfd_t flb_net_server_unix(const char *listen_path, int stream_mode,
             ^
```

Signed-off-by: Hiroshi Hatake <a476a6e5b5893650242fbf0b2961500a9bd9032e@calyptia.com>

Signed-off-by: Hiroshi Hatake <a476a6e5b5893650242fbf0b2961500a9bd9032e@calyptia.com>
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