fix 'switch back to original quality'

src/hm/Heuristic.h

@@ -103,7 +103,7 @@ class Heuristic {
                     // graceful evaluation for big inverters that have to send 4 answer packets
                     updateQuality(ih, RF_TX_CHAN_QUALITY_OK);
                 } else if((rxFragments - ih->lastRxFragments) < 2) {
-                    if(RF_TX_TEST_CHAN_1ST_USE == ih->txRfChId) {
+                    if(RF_TX_TEST_CHAN_1ST_USE == ih->testChId) {
                         // switch back to original quality
                         ih->txRfQuality[ih->txRfChId] = ih->saveOldTestQuality;
                     }