Fixed issue with missing network interfaces on iOS

Fixed issue with network interfaces due to a missing return value in the
"nw_path_enumerate_interfaces(...)" block. Exposed in iOS 18,
RTCNetworkMonitor::initWithObserver will only enumerate the first
interface, instead of all device interfaces

Bug: webrtc:359245764
Change-Id: Ifb9f28c33306c0096476a4afb0cdb4d734e87b2c

AUTHORS

@@ -33,6 +33,7 @@ Christophe Dumez <ch.dumez@samsung.com>
 Chris Tserng <tserng@amazon.com>
 Cody Barnes <conceptgenesis@gmail.com>
 Colin Plumb
+Corby Hoback <corby.hoback@gmail.com>
 Cyril Lashkevich <notorca@gmail.com>
 CZ Theng <cz.theng@gmail.com>
 Danail Kirov <dkirovbroadsoft@gmail.com>

sdk/objc/components/network/RTCNetworkMonitor.mm

@@ -89,6 +89,7 @@ - (instancetype)initWithObserver:(webrtc::NetworkMonitorObserver *)observer {
               RTCLog(@"NW path monitor available interface: %s", name);
               rtc::AdapterType adapterType = AdapterTypeFromInterfaceType(interfaceType);
               map->insert(std::pair<std::string, rtc::AdapterType>(name, adapterType));
+              return true;
             });
         @synchronized(strongSelf) {
           webrtc::NetworkMonitorObserver *observer = strongSelf->_observer;