Merge pull request #2417 from caetanominuzzo/fix-typo-in-base_coder

fix: Correct typo in base_coder by removing duplicate 'in'

aider/coders/base_coder.py

@@ -962,7 +962,7 @@ def fmt_system_prompt(self, prompt):
         if self.chat_language:
             language = self.chat_language
         else:
-            language = "in the same language they are using"
+            language = "the same language they are using"
 
         prompt = prompt.format(
             fence=self.fence,