Removed trailing whitespace from summary_json_system_prompt (#1037)

Author: jamesbraza

src/paperqa/prompts.py

@@ -107,8 +107,7 @@
   "relevance_score": "..."
 }}
 
-where `summary` is relevant information from the text - {summary_length} words. `relevance_score` is an integer 1-10 for the relevance of `summary` to the question.
-"""
+where `summary` is relevant information from the text - {summary_length} words. `relevance_score` is an integer 1-10 for the relevance of `summary` to the question."""
 
 env_system_prompt = (
     # Matching https://github.com/langchain-ai/langchain/blob/langchain%3D%3D0.2.3/libs/langchain/langchain/agents/openai_functions_agent/base.py#L213-L215