fix ghosting regression when opening subactivity from within reader

src/activities/reader/EpubReaderMenuActivity.cpp

@@ -1,7 +1,6 @@
 #include "EpubReaderMenuActivity.h"
 
 #include <GfxRenderer.h>
-#include <HalGPIO.h>
 #include <I18n.h>
 
 #include "KOReaderCredentialStore.h"
@@ -234,10 +233,5 @@ void EpubReaderMenuActivity::render(RenderLock&&) {
   const auto labels = mappedInput.mapLabels(tr(STR_BACK), tr(STR_SELECT), tr(STR_DIR_UP), tr(STR_DIR_DOWN));
   GUI.drawButtonHints(renderer, labels.btn1, labels.btn2, labels.btn3, labels.btn4);
 
-  if (gpio.deviceIsX3() && !initialHalfRefreshDone) {
-    initialHalfRefreshDone = true;
-    renderer.displayBuffer(HalDisplay::HALF_REFRESH);
-  } else {
-    renderer.displayBuffer();
-  }
+  renderer.displayBuffer();
 }