Revert "replace all \r\n with just \n"

This reverts commit 2d5bde2.

Author: RobinMalfait

crates/oxide/src/extractor/pre_processors/pre_processor.rs

@@ -131,7 +131,7 @@ pub trait PreProcessor: Sized + Default {
             lines.insert(line_idx + 1, annotation_line);
         }
 
-        (lines.join("\n").trim_end().to_string() + "\n").replace("\r\n", "\n")
+        lines.join("\n").trim_end().to_string() + "\n"
     }
 }