For our first position send on boot, validate that we have received a fresh position (#9023)

src/mesh/MeshService.cpp

@@ -276,6 +276,10 @@ bool MeshService::trySendPosition(NodeNum dest, bool wantReplies)
     if (nodeDB->hasValidPosition(node)) {
 #if HAS_GPS && !MESHTASTIC_EXCLUDE_GPS
         if (positionModule) {
+            if (!config.position.fixed_position && !nodeDB->hasLocalPositionSinceBoot()) {
+                LOG_DEBUG("Skip position ping; no fresh position since boot");
+                return false;
+            }
             LOG_INFO("Send position ping to 0x%x, wantReplies=%d, channel=%d", dest, wantReplies, node->channel);
             positionModule->sendOurPosition(dest, wantReplies, node->channel);
             return true;