Adjust navigation at end of book to home page on forward press

(cherry picked from commit deb6ff3b9d1a284594540513f19a3191936915c9)

src/activities/reader/TxtReaderActivity.cpp

@@ -138,9 +138,14 @@ void TxtReaderActivity::loop() {
   if (prevTriggered && currentPage > 0) {
     currentPage--;
     requestUpdate();
-  } else if (nextTriggered && currentPage < totalPages - 1) {
-    currentPage++;
-    requestUpdate();
+  } else if (nextTriggered) {
+    if (currentPage < totalPages - 1) {
+      currentPage++;
+      requestUpdate();
+    } else {
+      onGoHome();
+      return;
+    }
   }
 }