pw-top: use media.name as display name

Try to use `media.name` as the display name for a node
when none of the other keys are found in its properties.

For example, `pw_stream_new_simple()` only sets `media.name`
on the created node object by default.

src/tools/pw-top.c

@@ -171,6 +171,7 @@ static const char *find_node_name(const struct spa_dict *props)
 		PW_KEY_NODE_NAME,
 		PW_KEY_NODE_DESCRIPTION,
 		PW_KEY_APP_NAME,
+		PW_KEY_MEDIA_NAME,
 	};
 
 	SPA_FOR_EACH_ELEMENT_VAR(name_keys, key) {