Fix: made print sherpa_onnx_loge when it is in debug mode (#1838)

Currently, during normal use you may get a lot of print statements such as: `Use espeak-ng to handle the OOV: 'ipsum'` which may not be relevant unless you are debugging.

@@ -193,9 +193,11 @@ class KokoroMultiLangLexicon::Impl {
         auto ids = ConvertWordToIds(word);
         ans.insert(ans.end(), ids.begin(), ids.end());
       } else {
+        if (debug_) {
           SHERPA_ONNX_LOGE("Skip OOV: '%s'", word.c_str());
         }
       }
+    }
 
     return ans;
   }
@@ -312,7 +314,9 @@ class KokoroMultiLangLexicon::Impl {
         this_sentence.insert(this_sentence.end(), ids.begin(), ids.end());
         this_sentence.push_back(space_id);
       } else {
+        if (debug_) {
           SHERPA_ONNX_LOGE("Use espeak-ng to handle the OOV: '%s'", word.c_str());
+        }
         
         piper::eSpeakPhonemeConfig config;
 
@@ -333,11 +337,13 @@ class KokoroMultiLangLexicon::Impl {
             if (token2id_.count(token)) {
               ids.push_back(token2id_.at(token));
             } else {
+              if (debug_) {
                 SHERPA_ONNX_LOGE("Skip OOV token '%s' from '%s'", token.c_str(),
                                  word.c_str());
               }
             }
           }
+        }
 
         if (this_sentence.size() + ids.size() + 3 > max_len - 2) {
           this_sentence.push_back(0);