fix(ping): always set transmitted count regardless of ping success

When all pings fail (timeout -> Icmp.PingResult.Failed), rttList stays
empty and stats.transmitted was never assigned, leaving it at 0.

Move stats.transmitted = count before the rttList.isNotEmpty() check so
it always reflects the number of attempted pings, matching the expected
semantics of "packets transmitted".

This unblocks HandshakeRestartHandler.awaitPingFailures() (introduced in
#1182) which requires transmitted > 0 to distinguish a real failure from
pings not routed through the tunnel.

Author: naonak

app/src/main/java/com/zaneschepke/wireguardautotunnel/util/network/NetworkUtils.kt

@@ -62,8 +62,8 @@ class NetworkUtils(private val ioDispatcher: CoroutineDispatcher) {
                     }
                     .collect()
 
+                stats.transmitted = count
                 if (rttList.isNotEmpty()) {
-                    stats.transmitted = count
                     stats.received = received
                     stats.packetLoss = ((count - received).toDouble().round(2) / count) * 100
                     stats.rttMin = rttList.minOrNull()?.round(2) ?: 0.0