Fix: Use elif to prevent streaming token usage override

Changed the second if statement to elif in _calculate_completions_token_usage
to ensure that streaming_message_token_usage takes precedence over response.usage.
This prevents valid streaming usage data from being silently overwritten when
response has a usage attribute.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: cursoragent

sentry_sdk/integrations/openai.py

@@ -164,8 +164,7 @@ def _calculate_completions_token_usage(
 
     if streaming_message_token_usage:
         usage = streaming_message_token_usage
-
-    if hasattr(response, "usage"):
+    elif hasattr(response, "usage"):
         usage = response.usage
 
     if usage is not None: