refactor: Explicitly convert atomic<int> to int

Author: promag

src/rpc/blockchain.cpp

@@ -2085,7 +2085,7 @@ static RPCHelpMan scantxoutset()
             // no scan in progress
             return NullUniValue;
         }
-        result.pushKV("progress", g_scan_progress);
+        result.pushKV("progress", g_scan_progress.load());
         return result;
     } else if (request.params[0].get_str() == "abort") {
         CoinsViewScanReserver reserver;