rhg: Rename cat_file_is_modified

It hasn’t been based on the "cat operation" for some time already.

Differential Revision: https://phab.mercurial-scm.org/D11773

rust/rhg/src/commands/status.rs

@@ -227,7 +227,7 b' pub fn run(invocation: &crate::CliInvoca'
             CommandError::from((e, &*format!("{:x}", p1.short())))
         })?;
         for to_check in ds_status.unsure {
-            if cat_file_is_modified(repo, &manifest, &to_check)? {
+            if unsure_is_modified(repo, &manifest, &to_check)? {
                 if display_states.modified {
                     ds_status.modified.push(to_check);
                 }
@@ -304,7 +304,7 b' fn display_status_paths('
 /// to time resolution limits.
 ///
 /// TODO: detect permission bits and similar metadata modifications
-fn cat_file_is_modified(
+fn unsure_is_modified(
     repo: &Repo,
     manifest: &Manifest,
     hg_path: &HgPath,