fix: adjust qwen 2.5 coder stop tokens

Author: carlrobertoh

src/main/kotlin/ee/carlrobert/codegpt/codecompletions/InfillPromptTemplate.kt

@@ -53,6 +53,7 @@ enum class InfillPromptTemplate(val label: String, val stopTokens: List<String>?
     CODE_QWEN_2_5(
         "CodeQwen2.5",
         listOf(
+            "diff --git",
             "package ",
             "import ",
             "<|endoftext|>",