Bugfix: Some squelch types did not report the integrated siglev

Squelch types DDR, SIM and TONE reported the "raw" signal strength
instead of the integrated one. This fix can change the behavior of the
voter and the extended hangtime feature.

src/svxlink/trx/SigLevDetDdr.cpp

@@ -234,7 +234,7 @@ void SigLevDetDdr::processSamples(const vector<RtlTcp::Sample> &samples)
 	update_counter += block_size;
 	if (update_counter >= update_interval)
 	{
-	  signalLevelUpdated(lastSiglev());
+	  signalLevelUpdated(siglevIntegrated());
 	  update_counter = 0;
 	}
       }

src/svxlink/trx/SigLevDetSim.cpp

@@ -238,7 +238,7 @@ int SigLevDetSim::writeSamples(const float *samples, int count)
       if (++update_counter >= update_interval)
       {
         update_counter = 0;
-        signalLevelUpdated(lastSiglev());
+        signalLevelUpdated(siglevIntegrated());
       }
     }
   }

src/svxlink/trx/SigLevDetTone.cpp

@@ -386,7 +386,7 @@ int SigLevDetTone::processSamples(const float *samples, int count)
 	update_counter += BLOCK_SIZE;
 	if (update_counter >= update_interval)
 	{
-	  signalLevelUpdated(lastSiglev());
+	  signalLevelUpdated(siglevIntegrated());
 	  update_counter = 0;
 	}
       }