fix: embedding get price definition missing (#922)

api/core/indexing_runner.py

         return {
             "total_segments": total_segments,
             "tokens": tokens,
-            "total_price": '{:f}'.format(embedding_model.get_token_price(tokens)),
+            "total_price": '{:f}'.format(embedding_model.calc_tokens_price(tokens)),
             "currency": embedding_model.get_currency(),
             "preview": preview_texts
         }

api/core/model_providers/models/embedding/base.py

         logger.debug(f"model: {self.name} price_config: {self._price_config}")
         return self._price_config
 
-    def calc_tokens_price(self, tokens:int) -> decimal.Decimal:
+    def calc_tokens_price(self, tokens: int) -> decimal.Decimal:
         """
         calc tokens total price.