Revert "fix shadowenv_data parts parse"

This reverts commit 4c7c4ed.

Author: burke

src/diff.rs

@@ -32,9 +32,8 @@ fn run_with_logger(
     color: bool,
     shadowenv_data: String,
 ) -> i32 {
-    let mut parts = shadowenv_data.splitn(3, ':');
+    let mut parts = shadowenv_data.splitn(2, ':');
     let _prev_hash = parts.next();
-    let _prev_dirs = parts.next().unwrap_or("[]");
     let json_data = parts.next().unwrap_or("{}");
     let shadowenv_data = undo::Data::from_str(json_data).unwrap();
     let mut scalars = shadowenv_data
@@ -155,7 +154,7 @@ mod tests {
             ("VAR_C".to_string(), "/added:/existent".to_string()),
         ];
 
-        let data = r#"62b0b9f86cda84d4:[]:{"scalars":[],"lists":[{"name":"VAR_C","additions":["/added"],"deletions":["/removed"]},{"name":"VAR_B","additions":["/added"],"deletions":[]},{"name":"VAR_A","additions":["/added"],"deletions":[]}]}"#;
+        let data = r#"62b0b9f86cda84d4:{"scalars":[],"lists":[{"name":"VAR_C","additions":["/added"],"deletions":["/removed"]},{"name":"VAR_B","additions":["/added"],"deletions":[]},{"name":"VAR_A","additions":["/added"],"deletions":[]}]}"#;
         let result = run_with_logger(&mut logger, env_vars, false, false, data.to_string());
 
         let expected: Vec<_> = [