Remove sending network ping to displayed node on interval

src/modules/esp32/AudioModule.cpp

@@ -153,8 +153,6 @@ AudioModule::AudioModule() : SinglePortModule("AudioModule", meshtastic_PortNum_
 
 void AudioModule::drawFrame(OLEDDisplay *display, OLEDDisplayUiState *state, int16_t x, int16_t y)
 {
-    displayedNodeNum = 0; // Not currently showing a node pane
-
     char buffer[50];
 
     display->setTextAlignment(TEXT_ALIGN_LEFT);