android: show alternative to misleading error log

An error level message was being shown on logcat on non native modules
scenarios, which was misleading. Shows a debug level message instead.

android/src/main/java/com/janeasystems/rn_nodejs_mobile/RNNodeJsMobileModule.java

@@ -399,6 +399,8 @@ private ArrayList<String> readFileFromAssets(String filename){
         line = reader.readLine();
       }
       reader.close();
+    } catch (FileNotFoundException e) {
+      Log.d(TAG, "File not found: " + filename);
     } catch (IOException e) {
       lines = new ArrayList();
       e.printStackTrace();