Remove one unused statement in the unit test for Hosts

Author: Sergii Zhevzhyk

lib/src/test/java/io/ably/lib/transport/HostsTest.java

@@ -251,10 +251,7 @@ public void hosts_use_default_fallback_hosts_and_tlsport_are_defined() throws Ab
         options.fallbackHostsUseDefault = true;
 
         // When
-        Hosts hosts = new Hosts(null, Defaults.HOST_REALTIME, options);
-
-        // Then
-        assertThat(hosts.getFallback(Defaults.HOST_REALTIME), nullValue());
+        new Hosts(null, Defaults.HOST_REALTIME, options);
     }
 
     private List<String> collectFallbackHosts(Hosts hosts) {